When Kotonoha first started dating Makoto, they did not mesh well together. Makoto's thoughts were all over the place thinking about Kotonoha. He saw Kotonoha in the train in a bad mood and tried to hug her but she refused. Hikaru, who is in the same class as Makoto, happened to see this.

Things have developed with Sekai and Makoto. From the outside, it seems like Makoto is still involved with Kotonoha, however his relationship with Sekai has accelerated. While, Sekai knows its bad to keep lying like this, she can't turn away Makoto. Gradually, Makoto starts avoiding Kotonoha by not answering if phone...

Makoto has put out the outwardly appearance that he is avoiding Kotonoha, as his relationship with Sekai has developed even more. Setsuna has noticed that their relationship together has changed, and tells Makoto to stay away from Kotonoha and cut off all communication with her, for Sekai's sake. But the web of lies and relationships starts to get tangled...

Makoto makes a promise to Sekai to dance with her during the School Festival's folkdance; however, he also made the same promise to Kotonoha. As Kotonoha mans the front desk at her class' school festival activity, she ferverously texts Makoto and awaits for a single response back...

As the school festival comes to an end and Makoto and Sekai dance at the bonfire, it finally seems like they're happy together and things have settled down. However, Kotonoha watches from the shadows, and obstiantly denies what has happened still believing that their still going out. Meanwhile, as Setsuna prepares to move to France she is doing some final preparations to ensure that her best friend - Sekai - will be taken care of...

Christmas is coming around the corner, and although Makoto is dating Sekai, it seems as if he wants out of it. So it appears as if he is haphazardly getting himself involved in other relationships, despite his promise to Setsuna. Now things are going terribly wrong, as Kotonoha loses herself, Sekai finds out about Makoto's infidelity, Setsuna's move to France and most importantly a sudden change to her body...

Originally an April's Fool in 2007, this one episode OVA is a spin-off of the School Days game by 0verflow, and shows Kokoro Katsura, the little sister of one of the main characters, from her other side. A mahou shoujo out to save the world, or something like that.