Haru no Ashioto

Haru no Ashioto (はるのあしおと) is a Japanese adult visual novel by Minori released on July 23, 2004. A PlayStation 2 port, Haru no Ashioto -Step of Spring- (はるのあしおと -Step of Spring-), was released on April 6, 2006, and a fandisc, Sakura no Saku Koro (さくらのさくころ), was released on March 31, 2006. An OVA entitled Haru no Ashioto The Movie: Ourin Dakkan aired on March 31, 2006 featuring an alternative story.

Plot
In the OVA, the else so peaceful mood in the Ourin Gakuen suddenly changes. Aoi Kusunoki-sensei, the so-called sub heroine, along with most of the students takes over the school after a coup d'état. The principal is beaten and now it`s up to Yuu Sakurano, Yuzuki Kaede and Nagomi Fujikura to take back the school from her and return it to the former peaceful days.

This is the start of a full-scale war, one that this school has never seen before.