Title: Q
Vocal: Otomachi Una
Lyrics, Composition, Arrangement: Wada Takeaki (Kurage-P)
Link to the full video is here.
This is the kanji, romaji, and translation of the song. Translation is done by me; sorry if there are mistakes or a better translation had been done before!
I'd just started following Kiyo's playthrough of Arune no Jikenbo (The Book Case of Arne)! It's such an interesting game and I'm always looking forward to the new playthrough update everyday ^^