Kamen Rider Ryuki

Yui's Past (1x21)

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After discovering Ren's reason for entering the Rider Fight, Shinji hesitates if he should fight or not. Meanwhile, Yui and Tezuka make a discovery at the old mansion that is connected to her and Shiro's past. As Ren prepares another battle with Asakura, Shinji appears in front of them, deciding that he will fight Ren till the end.