Dungeon de Tatakaitsuzukete 20-nen no Doutei Yuusha, Chijou ni Modottara Danjoubi 1:1000 no Sekai Datta
The Virgin Hero Who Fought in the Dungeon for 20 Years Returned to the Surface Only to Find the Population of the World has Dropped Drastically, with a Male-to-Female Ratio of 1:1000 / ダンジョンで戦い続けて20年の童貞勇者、地上に戻ったら男女比1:1000の世界だった（コミック）
The legendary hero Ryuto, who vanished into the depths of a Dungeon to subjugate the Demon King, wandered inside for 20 years before returning to the surface. However, the world he returned to was one where the male population had plummeted due to the Demon King's curse, and women's sense of chastity had drastically changed. Every woman he meets is a beauty, and what's more, they all approach Ryuto. While Ryuto unintentionally charms those around him and causes commotions, he senses the shadow of the Demon King in the monsters emerging from the Dungeon and throws himself back into the battlefield.
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