Quick answer — Reina Takeshita voices Kurou Ootani in Komori-san Can't Decline!, Ikue Usami in Momokuri.
Reina Takeshita voices Kurou Ootani (Komori-san Can't Decline!), Ikue Usami (Momokuri).
Kurou Ootani is voiced in Japanese by Reina Takeshita.