These two have a good friendship and hang out during and after school hours. She is supportive of Akari's decisions, but is also realistic, saying that Akari couldn't be Aria's amica. However, when Akari managed to become close to Aria, Raika went with it and was supportive of Akari when she would obsess over Aria. Akari suggests many things related to Kirin to Raika, helping Raika become more honest with her feelings. Raika is also open to helping Akari improve her skills as a Butei.
At first, Raika saw Kirin as a nuisance for following her around. These two then have a fight off with Akari acting as referee where if Kirin lost, she would have to stop following Raika, and if Raika lost, she would allow Kirin's to be her amica. Kirin demonstrates great skill in the fight and uses a footlock technique to try and defeat Raika. Though this is a technique Raika is good at blocking, she allowed Kirin to win and thus Kirin's became her amica.
The two's relationship became more intimate as time went on with Kirin clinging onto Raika dearly and Raika continuing to act as though Kirin is a bother. Despite Raika's act, she becomes overly jealous when Kirin gets too close with her previous partner, Riko. Also, Raika has a picture of Kirin in her bedroom.
Both in the same friendship circle as Akari. Though Shino gets easily possessive of Akari, Raika is an exception because Shino doesn't show any signs of hatred towards Raika over Akari. These two get along well and seem to have become friends through Akari.
Raika is shown to respect her.