Fics like Harem Hero

Your best friend in the whole world is Mitsuru. A mad scientist genius who has recruited you to be her first and only assistant. One day at the lab she reveals her latest invention, an incredible gun that can shatter the barrier between realities and summon powerful warriors from other times, places and dimensions. The world is in danger from deadly invaders, and by leveraging a multi-universal love of an anime franchise starring you as the main character, you can summon dozens of women who are madly in love with you to fight back. Sounds simple enough, right?

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