"Shukubo no Shinshitsu"? If it's 叔母の寝室 (romanized "oba no shinshitsu" on all Japanese websites which did so) then there's a very tasty sample at the less tasty
site. Not particularly Kikuta-sounding to me, and no mention of Kikuta as composer, but his site is linked in the "creator" section of the site's link page whatever that's worth...
Edit: That sample is the theme piece which is explicitly credited to 和田貴史 (Takashi Wada?). No idea if he did the rest of the soundtrack as well as the theme piece is all they talk about music wise on the site.
Edit2: In the trailer
Angel Note is credited for "BGM ・Arrangement", I'll suppose for now that includes composing as well. *shrugs
Jam it back in, in the dark.