When Mayu was 7-8, Yuki told Mayu that he wouldn’t accompany her to her regular volleyball club unless she helps him practice. Yuki said in an interview that he was scolded by Mama Midori because of this saying he should “do his own job and not use his sister.”
Inoue Marina, Ishikawa Yui, and Kaji Yuki「Shingeki no Kyojin」Pre-air Livestream FINALby inspyral