She's the Strongest Bride, But I'm Stronger in Night Battles: A Harem Chronicle of Advancing Through Cunning Tactics

In this spicy isekai, an ordinary man becomes a military genius and the hottest lover in the realm--in another world!

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異世界最強の嫁ですが、夜の戦いは俺の方が強いようです　知略を活かして成り上がるハーレム戦記