Mijuku Kajitsu

Summary

Sonoko and Shou are childhood friends. One day he suddenly asks Sonoko out. He tries to kiss her and she tells him it's too soon, she then remembers a time in the past when they saw a movie together and learnt that a kiss is something special between two people, which makes her wait. Sonoko forgets something in the classroom and encounters a guy who demands she give him her body and he kisses her. (from Onigiri Gakuen)