During the freshmen orientation, Makoto Itou met Kotonoha Katsura and immediately developed a crush on her. They would ride on the same train together every morning, and all Makoto could do was make himself look busy by looking at the standby screen on his cell phone...

Sekai disappears, and Makoto is wandering around aimlessly until he meets up with Kotonoha again, under the town's Christmas tree. As they pass the night together and Sekai witnesses the two of them heading back to Makoto's place. Just to make sure her eyes weren't playing tricks on her, Sekai heads over to his place...

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.