Onee-San Is Invading!?

Toono Ao didn’t make it into university, leaving him as a ronin preparing for next year’s entrance exams. Determined to focus on his studies, he rented a small apartment close to his cram school—nothing fancy, but at least it was his private space. However, his peaceful solitude didn’t last long. One evening, a tipsy woman stumbled into his new home, refusing to leave no matter how much he protested. She made herself comfortable, eating his food, using his things, and completely disregarding his boundaries. At first, Ao was furious—this was his sanctuary, after all. But as time passed, he began questioning whether her presence was really such a bad thing. His once-quiet apartment had been taken over, and now, an unexpected onee-san had fully invaded his life.