Manga Tsugumomo

For Kazuya, there is nothing more valuable than a gift from her mother - Sakura Obi. Therefore, he keeps it like nothing else in this life. But one day his life changes dramatically when the beautiful girl Kiriha appears in it. She begins to live with a guy in his room. Kazuya also has a childhood friend who constantly pokes his nose where not asked.
And it would seem that enough characters have appeared in the life of the protagonist, when suddenly the older sister decides to intervene in it, whose care goes beyond all boundaries. Moreover, she wants to take a bath with him. Added to this is a witch with a huge breast size, as well as a bunch of other sexy girls. You seem to already guess how Kazuya's eventful life will develop.