The brother of Yumi (born one year apart), he loves her very much and tries to help her in everything he can. He has good relations with the students of Lillian and is somewhat popular. At the beginning of the series, he did not empathize with Suguru, but Suguru invites Yuuki to stay over for new year's in his house; subsequently Suguru begins to perturb Yuuki by giving him the nickname "Yukichi". Yuuki becomes the president of the Student Council of Hanadera due to his neutral personality.
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