Seikatsu Shuukan THE ANIMATION – Episode 1 (EN)

Shuntarou endures daily abuse from his three younger sisters after they catch him masturbating with their panties. Frustrated, he plays a mysterious "Sister Experience Week" game sent by email and suddenly shrinks into a cute little boy. He introduces himself as Koharu, an internet friend. His sisters, especially the busty Ayaka and loli-like Fuyuno, instantly adore the adorable "little brother" and reveal their hidden shotacon sides. What starts as innocent big-sister pampering quickly turns erotic — bath time, teasing, and intense one-on-one encounters filled with affection and lust. Shuntarou finally lives out his dream of having caring older sisters who can't get enough of him.