Isekai Hitokko Doubutsuen

Isekai Hitokko Doubutsuen: Boku wa Zetsumetsukikushu no Shiikuin ni narimashita (異世界ひとっ娘動物園　僕は絶滅危惧種の飼育員になりました) is a Japanese online manga by Yasuki Fujihara and serialized in Kodansha's Young Magazine website.

Plot
Yuzuki is just a zoo part-timer animal-loving guy who is weak around girls. One day after work, Yuzuki gets caught up in an accident and dies, but reincarnates into another world full of beastmen and his only weapons are...a deck brush and a bucket? He soon gets in trouble but gets quickly rescued by a half-beast girl named Aldra, and soon becomes the zoo director for endangered species, but what type of animals await Yuzuki to look after? This begins Yuzuki's reverse-ecological harem life of endangered beastwomen!