4-Thousand Fold Man4000-bai no Otoko; 4000倍の男; Girls on the Brain! x4000; 4000-fold Man; 4-Thousand-Fold Man; Четырёхтысячекратный парень; 4000倍的男

When you wake up after hitting your head, your sex drive will be multiplied by 4000?!Seigo Hasegawa, a man who has suddenly acquired a cheat sex drive, and his childhood friend An Yagami, who feels responsible for Seigo and tries to help him (sexually). The battle between Seigo and his sexual desire begins now... (MTL)