Please Teacher!: Volume 1 - Hot for Teacher (2001)

Kei Kusanagi isn't your typical 15 year old high school student. He's actually an 18 year old with a rare disorder that puts him into what he calls a "standstill". When he was younger, the disorder left him in a deep coma which stunted his growth for the next three years! Mizuho Kazami isn't your typical teacher either. She's actually an alien sent by the Galazy Fede...