Kanmusu's school is modeled after the former Naval Academy Student Hall in Etajima. It is a school to train naval officers. The school was built in 1893.
It is a beautiful building, called the "red brick". The building is now also used as officer school of the Self-Defense Forces.
You do not need a reservation. However, the tour time are predetermined. The tour duration is about an hour and a half. You will visit it in a group, and you are not free to leave in the middle of it.
There are a main canon shells of the Yamato and Type A Kō-hyōteki-class submarines there. Do not miss it!