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Mari Gangi's "4,000-Fold Man" (4000倍の男) is an ecchi-comedy manga serialized in Young Animal about Seigo Hasegawa, a high schooler who acquires a massive, 4,000-fold libido after a head injury. The story follows Seigo and his friend An Yagami navigating this chaotic, high-stakes situation, with the series progressing well past Chapter 18 to over 30 chapters. ４０００倍の男 1 - 白泉社