さよなら恋人、またきて友だち～ロスト・チャイルド～
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The first tankōbon volume of the series’ spin-off, Sayonara Koibito, Mata Kite Tomodachi ~Miyauchi Yuki ni Tsuite vol. 1~, was titled Sayonara Koibito, Mata Kite Tomodachi ~Lost Child vol. 2~ when it was serialized in the Omegaverse Project magazine.