Animal X

You are reading Animal X manga, one of the most popular manga covering in Action, Adventure, Drama, Gender bender, Harem, Horror, Manga, Sci fi, Shoujo, Shounen ai, Smut, Supernatural, Tragedy, Yaoi genres, written by Sugimoto ami at KaliScan, a top manga site to offering for read manga online free. Animal X has 24 translated chapters and translations of other chapters are in progress. Lets enjoy.
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27 year-old Ayukawa Yuuji is a mild-mannered biology researcher with a fiancée. After agreeing to being a test subject for a new drug, a young man breaks into his room and declares, "You're going to have my kid!"

Yuuji suddenly finds himself the sole target of a lost race that turns into dinosaurs, an extremely scary woman with a Goddess-Complex, the yakuza, a mad scientist and one 17 year-old boy who really, really, really wants to sleep with him.

(adapted from Mangaupdates.com)

Series:
1. Aragami no Ichizoku (4 volumes)
2. Daichi no Okite (2 volumes)
3. Genshi Sairai (10 volumes)