赤い沼の底 (Akai Numa no Soko)

Background
After this I began getting weirder

The story of a girl who commited an unforgivable sin and is sent to hell. Unlike her fellow damned, she believe she deserves to be there and accepts her punishment.

This was originally part of the Dark Woods Circus Series, but was presumably declared non-canon after the release of the novel.

This song has entered the Hall of Fame.