Succubato: A hero who falls for the charms and gets milked dry

Developer's description

You, a young man living an ordinary life in modern Japan, are suddenly summoned to another world by a girl named Aira. Aira calls you "Hero" and tells you that your mission is to defeat the Demon King of this world. She also declares that you cannot return to your own world until you have fulfilled that mission. Thus, without realizing you are a hero, your adventure in another world begins. Spoiler However, this world was a unique environment that was far from straightforward. Due to the "Succubus Curse" cast by the Demon Lord on the world, the women of this world possessed the characteristics of succubi. The attacks women directed at men took the form of seduction and semen extraction, and if a man lost, his level would be drained. It was a harsh environment where men were at a disadvantage. On top of that, they're also being targeted by the succubi of the Demon Lord's army, whose power is expanding even further...? In this overwhelmingly female-dominated world, what kind of ending will you reach?