Slap Happy Humphrey was the band that covered Morita Doji. Only Mineko of Angel'in Heavy Syrup was involved. That album is utterly unique:
http://www.youtube.com/watch?v=hOG5az5b9lU
AiHS was/is a fantastic group... there's been no official break-up, but the span since IV and the fact that Fusao Toda plays with Acid Eater now probably means something.