Uragiri wa Boku no Namae wo Shitteiru
裏切りは僕の名前を知っている
Source
Shinomiya brothers have a "SECRET"
Shinomiya-kun ni wa Wake ga Aru· 四ノ宮くんには理由がある
manga
63
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In the story, Sora is the youngest child, raised among all male siblings, and is doted upon. But Sora (and the rest of the brothers) have a secret that they can't tell anyone. (Source: Anime News Network)
Side Story
At the End of Emotions Dissolved in Deep Crimson
Uragiri wa Boku no Namae o Shitte Iru - Shinkou ni Tokeyuku Omoi no Hate ni· 裏切りは僕の名前を知っている 深紅にとけゆく想いの果てに
novel
Manga adaptation of the original stage play from November 2012, which features back stories for Yuki, Luka and the Zweilt guardians before the events of the main story.
Side Story
At the End of Emotions Dissolved in Deep Crimson
Shinkou ni Tokeyuku Omoi no Hate ni· 深紅にとけゆく想いの果てに
manga
Contains original side stories related to the Uraboku stage play from Nov 2012, where it maybe have back stories of Luka, Yuki and the Zweilt guardians before the events of the main story.