Aoki Ume manga
Kei Sonofuji is trying to get a new start by changing her image before getting into high school. But just as it seems everything is going to go well, she gets sick and has to miss the first week. Just as she thinks she's missed out on everything, she gets a surprise from one of her classmates!
Accepted to a high school specializing in the arts, Yuno moves into a nearby apartment complex to make her commute easier. Just a few days into her new routine, she quickly discovers that creativity doesn’t end with the art school bell! Her neighbors–Sae, Hiro, and Miya–are all fellow students, and each has her own hilarious quirks. And eccentricity clearly rules this school; Yuno’s homeroom teach is a cosplay otaku and the principal is just…weird. Will the quiet Yuno be able to handle this creatively kooky cast of characters?
Akasegawa Naoya's mother remarried recently and he suddenly finds himself trying to get along with his new big sister Amane, a student of the prestigious Kasugano Girls' School. But his new big sister isn't like what you might first expect.