第23話: 十樹シムラのトラウマを抱えた幼少期と、死の Decay Quirk の致命的な発現

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Re-Destro overwhelms Shigaraki, destroying his left hand and the hands he wears all over his body, causing him to experience flashes of his deceased family. As a child, Tenko Shimura (Shigaraki) lives under the one harsh rule of his father Kotaro: never talk about heroes, as they do nothing but hurt their own families to help strangers. Despite this, Tenko's sister sneaks him a picture of their grandmother, Nana Shimura. However, Tenko's excitement is slapped away by his father's rage, while his family watches on, unsure of what to do. Thinking back to when Nana abandoned him to the foster system, Kotaro realizes he made a mistake. Tenko's Quirk manifests, killing his entire family one by one, even his mother as she attempts to comfort him. He attempts to beg his father for help, but Kotaro attacks him. Enraged, Tenko jumps on his father and purposely kills him with his Decay. Among the blood and rubble, Tenko feels a strange sense of pleasure and acknowledges that he may have wanted this all along. (Source: Wikipedia)