My Family's Secret Website

Sohen is an ordinary guy who lives in a house where only women rule: caring mother Karin, gentle grandmother Runo and cute younger sister Phoebe. After a childhood tragedy, he was adopted and grew up in a warm, but a little too close family atmosphere. Now his life is only peace and stability, but one day he accidentally finds an unknown website, where important information about the activities of his new family is hidden, as well as the truth that over time will radically change not only his life, but also the people close to him... — Description from novelcodex.org