Toradora Spin-off!

1. The Cherry-Coloured Tornado of Happiness (幸福の桜色トルネード)
Tomiie Kouta is a 1st year high-school student. One day, Kouta meets with Kano Sakura, the younger sister of Kano Sumire who is "everyone's brother" and the Student Council President. Kouta is attracted to the bright and cute Sakura, but Sakura was a naive innocent girl who did not know her sexual attractiveness!
Kouta, who is led to help Sakura study for her failed mid-term test retakes, struggles with immoral imaginations and thoughts being in front of Sakura... What's going to become with the love between Kouta, who is not used to being happy, and Sakura who has no idea of whatsoever.....