A long time ago, there was a man who had a lover with superpowers but his lover passed away due to persecution against espers. In his wish for espers to be able to live normally like everyone else, he creat...

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Ryuusei saves a demon girl and ends up dying so she shares half of her power with him and now he's basically a demon too. If they separate, he dies. If they don't find the one who summoned her within a year,...