Houkago Love Age

Akabane loses a game of bridge and thus his feelings for their classmate, Satsuki is revealed by his friends. He denies it immediately but somehow she's attracted to him too? (Source: Shoujo Crusade & Eternal Heart)

Also contains:
half a year -kimi to 6 gatsu-
Kirai Kirai Mo?
Kimi ni Yell wo!
Kirai Kirai Mo? -extra-