The tatami-mat-covered section of the Main Hall contiguous with the grand entrance for the feudal lord was used for lectures, the first and last practices of the year, and other ceremonial occasions. The Main Hall was like an auditorium, gym, and large classroom all combined into one, and was partitioned into three rooms.
The innermost room on the east side has an alcove, and space was reserved for persons of high positions and class instructors on ceremonial occasions. The pupils stood in line in the second and third innermost rooms.
The tatami-mat-covered areas on both sides of the Hall were called irigawa, and at different times they were used as a passage, an anteroom for ceremonies, and a small classroom.
Because irigawa was supposed to be a passage for persons of high positions, pupils were required to use a wooden corridor outside of irigawa.