Moeyo Ken

Kidō Shinsengumi Moeyo Ken (機動新撰組 萌えよ剣) or Moeyo Ken in the English version, is a PS2 video game from 2002 developed by Enter Brain. A 4-episode OVA and a 13-episode anime adaptation were developed, where both are licensed by ADV Films.

Plot
Set in an alternate Meiji era, a boy named Sakamoto Ryunosuke returns to Kyoto from Shanghai with his youkai, Nekomaru. The law states that in order to live freely with humans, a youkai must be licensed. The Kidou Shinsengumi Co. Ltd. is responsible for the capture of unlicensed youkais but must fight with the Tsubamegumi, who resents the new law.