Shoujo Sect: Innocent Lovers (2008)

Handa Shinobu and Naitou Momoko have known each other since childhood. Shinobu fell in love with Momoko from the day they first met. Now in high school, Momoko has forgotten about the past, but Shinobu has not. Both follow their own paths but Shinbobu still hopes for Momoko to remember the promise they made long ago.