Ama Ama Koakuma

Hijiri Amamiya, an introverted loner, turned down a sudden confession from Ema Kohanai, the most popular girl in school.
Since that day, Kohanai-san started acting strangely.
She plastered herself to him on the train, deliberately flipped up her skirt to flash him on the stairs... Finally, she pushed him down in the gym...!?!

(Source: G-Walk, translated)

Notes:
- Includes one extra chapter.
- Originally serialized under the title Ore dake ni Koakuma na Doukyuusei: Futtara Oshitaosaremashita! (俺だけに小悪魔な同級生〜フったら押し倒されました！); COMIC Ananga Ranga Vol. 64,66,68,70,72,74,76,78.