One of them is my sister! Fanservice compilation / Kono Naka ni Hitori, Imouto ga Iru! fanservice compilation

 After the death of his father, 17-year-old Shogo Mikadono became the heir to a huge corporation. However, to finally take over, he must fulfill two conditions of the deceased parent's will – graduate from a prestigious academy and… before graduating, find a lifelong girlfriend to enter the world of big business as a married and respectable man. Being a normal young man, Shogo doesn't mind either, especially since his caring mother has already rented an apartment for her son to "strengthen relationships". In the new school, girls from all walks of life flocked to the wealthy guy like flies to honey, but, as always happens, a small problem arose!


Mikadono Jr. learned that he has a little sister, an illegitimate child of his father, and she studies at the same school! Alas, his father knew how to keep secrets, and there are no keys to the sister's identity, except that her approximate age is known. She herself regularly terrorizes "brother" by phone, confessing love, but strictly anonymously. Now poor Shogo, with all the wealth of choice, is like on a minefield – what if incest happens out of ignorance? A female special agent sent by the corporation to help the future heir only confused everything even more. It seems that the protagonist and we will have to figure it out ourselves!