Keiji's hometown is a bit weird, and among the strange customs is the funeral each person has for themselves when they turn 33. He's come back for the "funeral" of his former best friend Hakuga, but being back is bringing back memories of his relationship with Hakuga, and the feelings he never thought he'd have to deal with again.
(from M-U)

A young man, interested in doing research on urban regeneration to help repair his dystopian sci-fi future, comes to work for the genius Doctor Ginkaku, only to find he's retired from the country's research institution and taken up... super-elaborate sex toy development? What's more, he needs a guinea pig.