Shonan Seminar is a private preparatory school that focuses on simultaneous instruction. It is for elementary, junior high, and high school students. It provides guidance on entrance examinations for Yokohama Suiran High School and other top public schools, as well as junior high school entrance examinations for integrated public junior and senior high schools and university entrance examinations. There are schools in the Tokyo metropolitan area, mainly in Kanagawa Prefecture.

The institute is a joint venture with CyberAgent, Inc Through the development and operation of the Programming proficiency test as one of the largest programming tests in Japan, the institute provides evaluation indicators for programming education and promotes programming to a wide range of people.

QUREO is a joint venture with CA Tech Kids Inc. It provides programming materials and class support to cram schools and other learning institutions nationwide. QUREO Programming Classes is the No. 1 programming class in Japan*. Classes have also been expanded outside Japan to Thailand and Malaysia.

Shonan Seminar Ocean is a special subsidiary established to promote the employment of people with disabilities, specializing in mental and developmental disabilities. The aim of the company is to create a place where people who are willing to work can contribute to society by drawing out each other's potential, and to widely return the results to society, in order to realize a society where everyone can work with vitality.