Kaichi Junior and Senior High School

Inquiry as a Founding Principle

Kaichi Junior & Senior High School (Ikkanbu) has placed inquiry-based learning (探究学習) at the center of its educational identity since its establishment in 1997. This is not a supplementary program but a school-wide pedagogical commitment that shapes how every subject is taught and how students are expected to engage with knowledge.

The school's philosophy, as articulated in the principal's message on the official website, is built on the conviction that solid academic achievement is not an end in itself but the foundation from which deeper capacities are developed. These capacities include:

• Logical reasoning (論理的に考える力)
• Sound, accurate judgment (的確に判断する力)
• Clear self-expression (自分の考えを表現する力)
• Collaboration with others (他者と協働する力)
• Continuous self-directed learning (自ら学び続ける力)

These five competencies form the backbone of what Kaichi expects from its graduates, and they map closely to the IB learner profile and 21st-century skills frameworks.

A Nationally Pioneering Approach

A 2023 TV Tokyo documentary reported that Kaichi was among the earliest schools in Japan to implement campus-wide inquiry lessons. At the time the documentary was produced, middle school enrollment stood at 875 students and high school at 1,038 — a sizable institution for a school with this kind of pedagogical distinctiveness.

The school was formally authorized as an IB World School for the Diploma Programme on 18 November 2024, making it one of a still-small number of Japanese private schools to offer both the Japanese national curriculum and the IB DP within an integrated through-school structure. This dual commitment to national academic rigor and internationally recognized qualifications reflects the school's motto: 「世界へ羽ばたく翼を手に入れろ」 — 'Soar with wings that reach the world.'

School Motto (校訓) as Values in Action

The school's core motto (校訓) — Autonomy (自律), Creativity (創造), Fairness (公正) — reflects the same philosophy in more concise form. These are not decorative values but the organizing principles behind the inquiry-based curriculum: students are expected to think and act autonomously, to generate new ideas, and to engage ethically with their community and the world.

In practice, this means that even within a highly competitive academic environment — where 2023 university placement results included 7 students accepted to Tokyo University, 210 to Waseda/Keio/Jochi/Rikkyo, and 33 to medical faculties — the school's pedagogical identity is defined not by exam drilling alone, but by a commitment to developing the whole student as a thinker and a person.

Institutional Origins (1983–1997)

The school that would become Kaichi Junior & Senior High School (Ikkanbu) began life in 1983 as Saitama Daiichi High School (埼玉第一高等学校), a standard private high school in Saitama Prefecture. For over a decade it operated solely as a senior high school.

In 1997, the school underwent a fundamental transformation. A junior high school section was added to create an integrated through-school (中高一貫部), and the institution was rebranded as Kaichi Junior & Senior High School (Ikkanbu). At its founding, the school invited Nobel Prize–winning scientist Prof. Satoshi Ōmura (大村智) — recipient of the 2015 Nobel Prize in Physiology or Medicine — to serve as the school's namesake. This connection to scientific excellence was not incidental; it signaled the school's ambition to become a leading academic institution with a science and inquiry-oriented identity.

Organizational Evolution (1999–2004)

In 1999, the full organizational structure was formalized, with distinct middle-school (中高一貫部) and senior-high (高等部) departments operating under the Kaichi Gakuen school corporation (学校法人開智学園). By 2004, the broader Kaichi Gakuen corporation had expanded to open related affiliated schools, growing into a multi-campus educational network across Saitama and eventually beyond.

The school's Iwatsuki campus location — approximately 15 minutes on foot from Higashi-Iwatsuki Station on the Tobu Noda Line — has remained consistent throughout this evolution.

IB Authorization (2024)

The most recent milestone in the school's history came on 18 November 2024, when Kaichi Ikkanbu was officially recognized as an IB World School authorized to offer the IB Diploma Programme (IBO school code: 062070). This places the school among a select group of Japanese institutions offering both the rigorous national university-preparation curriculum and the internationally recognized IB DP within a single integrated institution.

This authorization represents the logical culmination of decades of inquiry-based education, aligning the school's long-standing pedagogical identity with a globally recognized qualification framework.

A Competitive Academic Environment

Kaichi Junior & Senior High School (Ikkanbu) is classified as a competitive preparatory school (進学校) in Saitama, and its university placement data reflects this status. In spring 2023, the school reported the following university acceptance results:

• Tokyo University (東京大学): 7 students
• Waseda, Keio, Jochi, Rikkyo (早慶上理): 210 students
• Medical school faculties (医学部): 33 students

With a high school enrollment of approximately 1,038 students across three year-groups, these figures translate to a notable medical placement rate and consistent representation at Japan's most selective national and private universities.

Medical School Pathway

The school has developed a particular reputation for medical school preparation. A dedicated TV Tokyo documentary in July 2023 highlighted the school's achievement of more than 30 medical faculty acceptances as a distinguishing characteristic. This focus on medicine is consistent with the school's broader science-emphasis and inquiry-based approach, which encourages students to engage deeply with biological and scientific questions from an early age.

Class Structure Supporting Academic Achievement

The school operates with ability-based streaming, including special advanced classes (known informally as 'S classes') for higher-achieving students from mid-secondary onwards. Middle school and high school cohorts remain separate, with students in Years 1–2 (junior secondary) eating lunch with their homeroom teachers — a deliberate pastoral structure that supports the transition from primary education.

From Year 3 of junior secondary onwards, students have greater freedom to use the cafeteria or purchase food from vendors on campus, reflecting a gradual increase in student independence that mirrors the school's broader educational philosophy of cultivating autonomous, self-directed learners.

Fee Context

Annual tuition fees are approximately ¥538,000, with a one-time enrollment fee of ¥100,000 payable on entry. First-year total costs including the enrollment fee are stated as ¥638,000. Additional costs include a fieldwork fund (approximately ¥160,000), uniform costs (¥178,200 for boys, ¥193,160 for girls), tablet and running costs (¥77,500), and association fees (¥54,000). While these are not negligible, they are broadly comparable to other competitive private through-schools in the greater Tokyo region.

Entry Points and Structure

Kaichi Junior & Senior High School (Ikkanbu) accepts students at two primary entry points: the junior high school (中学校) entry at Grade 7, which is by far the dominant pathway, and a smaller cohort of external applicants entering at the senior high school level (Grade 10). The integrated through-school structure means that the majority of the senior high school population consists of students who entered at the junior high level.

Examination in Japanese Only

A defining feature of Kaichi's admissions process is that entry examinations are conducted entirely in Japanese. There is no separate English-language test or English proficiency assessment as part of the admissions criteria. This means the school's admissions are designed for students educated within the Japanese school system, including domestic Japanese students and potentially some Japanese returnees (帰国子女) whose Japanese academic competency is sufficient.

This contrasts with internationally-facing schools in Japan that may conduct admissions in English or assess English proficiency as a prerequisite.

Competitive Selectivity

The school is generally regarded as a competitive (難関) school in Saitama Prefecture. However, specific acceptance rates and annual applicant volumes are not publicly disclosed by the school. Third-party exam preparation resources classify it as a competitive school, and given its university placement results — particularly medical school acceptances — it attracts motivated families from across the Saitama and greater Tokyo region.

No Formal English Requirement

Because instruction is primarily in Japanese and entry exams are Japanese-medium, there is no formal English requirement for admission. This will be a relevant consideration for families with limited Japanese language proficiency. With the school's recent IB DP authorization, it is possible that English expectations will evolve over time for the IB track, but as of the current available information, no English admissions requirement is stated.

Practical Admissions Advice

Families interested in applying should consult the official admissions guidelines on the school's website (ikkanbu.kaichigakuen.ed.jp), as specific dates, exam formats, and annual intake numbers are not publicly consolidated in third-party sources. A first-year enrollment fee of ¥100,000 is charged upon acceptance; this is non-refundable if a student withdraws after 31 March.

A School Named with Nobel Pedigree

One of the most distinctive features of Kaichi Junior & Senior High School (Ikkanbu) is its founding connection to Prof. Satoshi Ōmura (大村智), the Nobel Prize–winning microbiologist who received the 2015 Nobel Prize in Physiology or Medicine for his discovery of novel therapies against infections caused by roundworm parasites. Prof. Ōmura served as the school's namesake (名付け親) at its founding in 1997 — a symbolic endorsement that has shaped the school's aspirational identity as a place where serious scientific inquiry and intellectual ambition are expected of students.

This is not merely a historical footnote. The school's emphasis on inquiry-based learning (探究学習) — pioneered at a national level from the school's earliest years — is directly connected to this founding DNA. The school saw itself as an institution that would produce the next generation of scientists, thinkers, and professionals who could contribute to society at the highest levels.

IB Diploma Programme Authorization (November 2024)

The school's authorization as an IB World School (IBO school code: 062070), confirmed on 18 November 2024, represents a significant milestone. The IB Diploma Programme is one of the most internationally recognized pre-university qualifications in the world, and for Kaichi — a school serving predominantly Japanese local students preparing for the Japanese university entrance system — this authorization signals a deliberate expansion of its educational horizons.

Offering both the national Japanese curriculum and the IB DP within the same integrated through-school creates a distinctive dual pathway: students can pursue the Japanese university entrance track or, via the IB DP, position themselves for international university admissions. This duality is rare in Saitama and positions Kaichi as a genuinely distinctive option in the regional private school landscape.

The School Slogan as Embodiment of Ambition

The school's homepage prominently displays its slogan: 「世界へ羽ばたく翼を手に入れろ」 — 'Soar with wings that reach the world.' This is not a passive aspiration but an active challenge to students. Combined with the school motto (自律・創造・公正 — Autonomy, Creativity, Fairness), the message is consistent: Kaichi expects its students to develop the tools to engage with the world on their own terms, with intellectual integrity and creative confidence.