 If you liked
Mx0
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 ...then you might like
AKB49: Renai Kinshi Jourei
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If you are looking for manga where the MC is keeping a big secret then both stories have it.
Basically both stories have similar start where a guy really likes a girl and ends up in a new place because of her. But some circumstances make it so that they have to keep a "secret" if they want to continue with their "new life".