Danshi Koukousei wo Yashinaitai Onee-San no Hanashi.

The story follows Soramoto Minoru, a high school boy whose parents abandon him with a mountain of debt. Just when things seem hopeless, the kind-hearted woman next door steps in to rescue him. She takes Minoru under her wing, and soon he finds himself living with her—a beautiful older sister who adores him a little too much. She thinks he’s absolutely adorable and can’t resist spoiling him, leading to a strange but heartwarming new life together.