Rifuta Imu/Relationships

Saiki Kusuo
Imu was used by Kusuo in order to make Kokomi leave him by making it look like they were dating. However, when he tried to go along with it, it backfired and Imu started liking him for real. She later realized that it was Kokomi that she likes.

Teruhashi Kokomi
Kokomi and Imu have a strong relationship of that friends but for Imu, it's deeper than that. Imu, after misunderstanding that Kusuo wanted to date Teruhashi Kokomi but is going out with Aiura Mikoto, she had a change of mind thinking that the one she fell in love is Kokomi. The two became closer later in the series and she's doing her best to keep Kokomi from falling to Kusuo.