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 DetailsFormatMangaStatusFinishedSourceOriginalCountryJapan GenresComedyEcchiRomance TagsSeinenSurreal ComedyHandjob RecommendationsHakui wo Nuide Shitai KotoDiet For Sex!