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History

 * In 1948, based on the School Education Act promulgated the previous year, Keio Senior High Schools No. 1 and No. 2 were established as new senior high schools and classes began. In 1949, the names Keio Senior High Schools No. 1 and No. 2 were abolished, and they became "Keio Senior High School." After Keio facilities in Hiyoshi were returned from the American military, the high school relocated to Hiyoshi and classes commenced.
 * In November 1949, the first Hiyoshi Festival was held jointly by the Student Association, Cultural Association, and Athletic Association. In March 1951, the Student Association concluded all its duties, and a new Student Council was established. In April, the Student Council held its first Academy Council meeting.
 * In May 1952, the first Athletic Meet was held at the Hiyoshi Athletics Field.
 * In 1958, the Keio University Hiyoshi Commemorative Hall was completed, hosting the centennial commemoration ceremony of the founding of Keio University.
 * In 1963, the Hiyoshi Gymnasium (Hiyoshi Kaido) was completed. Its name was decided through a public solicitation from faculty and students.
 * In October 1968, the 20th-anniversary commemoration ceremony of Keio Senior High School's founding was held.
 * In May 1970, the Special Education Building (now Building A) was completed. In November 1973, a planetarium was installed. In November 1990, a computer classroom was newly established.
 * In March 1984, the New Building (now Building B) and the underground gymnasium were completed.
 * In January 2003, admissions based on individual achievements (approximately 40 positions) were implemented for the first time.
 * In April 2003, it was designated as a Super Science High School by the Ministry of Education, Culture, Sports, Science, and Technology.
 * In November 2009, the Mamushidani Gymnasium was completed.
 * In August 2018, the Hiyoshi Education Building was completed. The building was named the Koryu Building and Sozo Building, chosen through a solicitation from students.

Student facilities

 * Located in Keio University's Hiyoshi Campus, Keio Senior High School is integrated with other university facilities, and there is no separate gate for the high school.
 * Across its extensive campus, the high school has amenities such as a gymnasium, a sports ground, and a judo hall.
 * Beneath the sports ground, an air raid shelter from wartime remains, which once housed the Combined Fleet Headquarters and Maritime Escort Headquarters. Approximately once a month, tours of the air raid shelter are conducted and are open to the public.
 * The school cafeteria is also available.
 * The high school library alone holds a collection of 100,000 books.
 * Facilities such as a telescope, planetarium, and Foucault pendulum are also present.

School events

 * Sōkeisen
 * Hiyoshi Festival (school festival) in October
 * School trip

Clubs
At Keio Senior High School, 80 clubs are active in various fields such as academics, culture, and sports. Cultural clubs belong to the Cultural Organization Federation, while sports clubs belong to the Athletic Organization Federation.

Sports clubs

 * In 2023, the baseball team won the national summer high school baseball championship after 107 years, defeating last year's champs Sendai Ikuei Gakuen High School 8-2 in the final.