Rena Kashiba

Rena Kashiba is a classmate and friend of Tomoe Koga. Rena with her friends went to where Sakuta Azusagawa and Tomoe Koga worked, and as Sakuta came to take their order, Rena asked him if he was serious about Tomoe. Then Tomoe came and they told her she looked cute in her uniform. Rena then told Sakuta that if he was playing with Tomoe, she won't forgive him, which made Tomoe a bit happy.