Haruki appears (sings/talks) in the following CD singles.

2018 07.18	Hoshi no Dialogue (PCCG-70432)	Song
2019 08.07	Star Diamond (PCCG-1788)	Song
2021 06.30	Watashitachi ha Mou Butai no Ue (PCCG-2035)	Song
2022 09.07	Futari Pinocchio [CD+BD] [harmoe] (PCCG-2175)	Song