The Ordinary Duo!

Around the same time of Shizuka's return from France, Tsukushi's elementary school friend, Kazuya Aoike, transfers to Eitoku. Tsukasa becomes jealous of Kazuya and gives him a red slip. Eitoku's students begin bullying the two severely until Rui steps in to protect Tsukushi.

The show’s own verdict is on its page.