Koi x Kagi

Hinako's parents died several years ago, leaving her alone. Since then she has been passed from relative to another. Now she finds herself about to move to another new home, with a child her own age called Subaru.

(Source: MU)

Included one-shots:
Volume 1: Furidashi Koi no Diary
Volume 2: Kimi e Egaku Yell, Koi Uchuu∞