[2] In 1995, he directed the OVA adaptation of the manga Level C. This story of a gay romance was originally released on July 14, 1995.
[3] Later that year, he also directed the OAV anime Galaxy Fraulein Yuna: Siren's Sadness, which was released September 21, 1995.
[4] In 2003, Yamaguchi directed the TV series Mouse, which was based on the manga of the same name written by Satoru Akahori.
The 2003 twelve-episode series followed the adventures of a young teacher with the alternate identity of the master thief "Mouse".
[5] On April 11, 2020, Yamaguchi died at the age of 59 due to myocardial infarction from a cerebral hemorrhage.