TUMENECO
In This Mysterious Night (フシギナヨルニ, fushigina yoru ni)

TOUHOU SKY ARENA -UTAGE- (東方空宴歌-UTAGE-, touhou kuuenka -UTAGE-) by AREA ZERO – Track 7
Released: 2016-08-13 (Comiket 90)
Website
That What’s Passed Down (カタリツグモノ, kataritsugumono) – Track 9
Released: 2017-12-29 (Comiket 93)
Website

Arrangement: tomoya
Vocals: yukina
Lyrics: nanatsume (ななつめ)
Based on Boys and Girls of the Age of Science (科学世紀の少年少女) from Yumetagae Kagaku Seiki ~ Changeability of Strange Dream (夢違科学世紀　～ Changeability of Strange Dream).