4000-bai no Otoko Anime Details and Episodes When he woke up after hitting his head, his sex drive had increased 4000-fold⁉ Seigo Hasegawa suddenly acquired incredible sexual prowess. His childhood… Series info · Watch free · Trending anime · Airing schedule FormatMangaStatusFinishedSourceOriginalCountryJapan Comedy · Ecchi · Romance Seinen · Surreal Comedy · Handjob Hakui wo Nuide Shitai Koto · Diet For Sex!