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.Kouichi starts his day off leaving school with a big farewell from his other club members. When he gets home he hears a voice calling to him, next thing he knows he is surrounded by gians. One of whom declares that Kouichi is going to be his bride.

SOON

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One day, a 'Gate' suddenly opened on Earth, and through that Gate came pouring out monsters from the dungeon. To combat that, humans awakened special abilities... and here is a S-grade ability user who is depressed over not being able to date anyone