Kyou mo, Karera no Otonari de

Nao's mother's best friend decided to move into the house next door after her divorce, bringing along her son, Kyosuke-kun, who's around Nao's age. She couldn't be more excited when she finds out he's handsome—more so than his little brother, the reticent Tomoyasu. Nao's not sure how to handle the excitement of living next to these handsome siblings, but little does she know, the excitement is just getting started...!

(Source: Kodansha USA)