[Athena]

Finished up to 5 (as price, I lost 3 hours of sleep. )

Basically, if I do a comparison of anime and mangas I know, it's like a Ro-Kyu-Bu setting with emphasis on how the protagonist manages to live with the three girls.

Spoiler for Volumes 1-5:

Volume 1 is about being responsible of the three girls.
Volume 2 is mostly about a classmate of Sora and a high school girl neighbor suspicious of the MC. Involves Sora a lot.
Volume 3 is pretty random, well, it has the 7-5-3 or something like that, and Christmas.
Volume 4 is Miu-centered, and her mother.
Volume 5 is Hina-centered, and contains a small, tiny bit of Raika's "jealousy". Hard to say for the latter though.