Houkago, Kimi to Koi wo Shite.

Collection of one shots:

Girl's Revolution by Ikeyamada Go
Haru ni Naru Made Matte by Minase Ai (Also included in 37°C no Boyfriend)
Puberty BABY by Chiba Kozue (Also included in 7 Genme wa Himitsu)
Koi, damono by Shiraishi Yuki (Also included in Akuma de Koibito.)
Ore-sama Housekeeper by Ichikawa Shou (Also included in Ouchi e Kaerou)
Dare yori Soba de Kataomoi by Hoshimori Yukimo
Kanpeki na Kimi, Donkan na Anata. by Hattori Miki