Oosawa, Minami

She is a teacher and the club advisor for the "Game Creation Club." She calls herself a "lightning type" for some reason other than the fact that she carries a stun gun. She is well known by the club members as a heavy sleeper and does minimal efforts in the club such as for keeping the club alive as an advisory or helping the club to win occasionally. Most of the time she can be seen sleeping in the club.

(Source: Wikipedia)

Both manga and anime revealed that her jersey is a memento from a certain student that graduated. She keeps wearing that as a respect, even though she forgot her name.