Well-Hung Hero

When portals to other worlds unleash monster-filled dungeons across Earth, humanity awakens to new supernatural powers. Meet Ash: an S-Class hero cursed with a truly massive gift. Blessed (or burdened) with a radiant, colossal holy member, Ash has become the ultimate solo player. After all, who could possibly handle him? Enter Roose: a mysterious villain with the power to nullify abilities...and apparently, the only one capable of taking Ash on (and in)! Ash's holy sword is ready, but can he win Roose's heart as well as save the day?

(Source: Lezhin Entertainment)