11 titles recommended if you like Rainbow Days
Aharen-san wa Hakarenai
YuruYuri: Happy Go Lily
Our Dating Story: The Experienced You and the Inexperienced Me
Sasaki and Miyano
Seitokai Yakuindomo
Akebi's Sailor Uniform
Girlfriend, Girlfriend
We Never Learn: BOKUBEN
My Little Monster
WATATEN!: an Angel Flew Down to Me
SHOSHIMIN: How to Become Ordinary