The library is a two-layered construction on floors 3 and 3.5, located in the center of the Academic Ark. It holds a collection of over 500,000 books, which includes textbooks, topical new publications and magazines. It is also equipped with 360 panoramic reading tables and group study rooms. Approx. 10,000 magazines and books are also available in the Discovery Promenade.

"Academic Base," opening in April 2025 at Otemon Gakuin University, features the Innovation LAB within its core. This collaborative space connects classrooms and research offices on the same floors, enabling students to engage in cross-disciplinary projects "anytime, anywhere".
Equipped with ICT tools and flexible furniture, it integrates social areas to foster the university's "Work-Is-Learning" concept. The design encourages active "learning and teaching among peers," serving as a dynamic hub where professional boundaries blur to stimulate new ideas and academic innovation.

You can find a range of traditional Japanese meals from nutritious and hearty combo meals (Teishoku) to Udon or Gyudon, which are all 500 yen or cheaper. The restaurant is managed by a leading restaurant company, where an OIDAI alumni serves as CEO. The cafeteria also has a convenience store and a coffee shop.

English Café at Otemon (E-CO) is a social learning space and self-access center established in April 2013 to promote global communication skills, self-directed language learning and international exchange for all students and staff on campus.

The library holds a collection of 520,000 books, which includes textbooks, topical new publications and magazines, and audio-visual materials. It also is equipped with AV booths and study rooms. Reading on the terrace is also possible on sunny days.

The Central Building is evolving into a specialized research and support hub. Floors 4, 5, 7, 8, and 9 will provide labs and study rooms for Science and Engineering, while floors 1 and 3 expand Psychology research spaces. B1 and 2F house the enlarged Ai General Office and a new Disability Support Office. This shift integrates academic research with a student-centered support system.

Building 1 became a dedicated hub for the Faculty of Science and Engineering in 2025. Serving Mechanical and Electrical Engineering, it features a Joint-Use Equipment Room with advanced tools. B1 and 1F house labs for experiments and large machinery. The 2nd floor offers study rooms for graduation research; the 3rd floor has faculty labs, creating an integrated research environment.

Equipped with multimedia-compatible large-scale classrooms which can contain approx. 550 students maximum at once. Events and academic conferences are also held at “Yushun Hall” located on the 2nd floor.

This field is the size of a professional soccer field. It is also equipped with night game facilities. In 2011, the entire field was replaced with artificial turf to improve safety.

The Cafeteria Building’s 3rd floor will be renovated in 2026 as a dedicated Student Lounge, primarily for the Faculty of Science and Engineering. With the keyword "Terrace," the space will feature 105 seats, including outdoor areas and sofas. The concept is to provide a relaxing space for students between classes, evolving the dining hall into a versatile "place to belong" for campus life.

This is a museum intended to transmit this university’s history and convey the thoughts and aspirations of some of its notable figures to people of the present day. Alumni and their parents and guardians may also freely visit the museum, which also functions as a place for interpersonal exchange.

The Training Center is a gym facility which students and school personnel in general can use for the purpose of maintaining their health, even if they are not a member of an extracurricular club or group. In addition to a variety of training and gym equipment, the facility also has changing rooms, shower rooms and a resident trainer.