Doutei Yuusha wa Nakayoku Shitai

The hero and his party finally reach the Demon King's castle. However, the Demon King's room is cursed with a death sentence for any virgin who enters it!! In order to defeat the Demon King, the virgin hero and his fellow heroines try various strategies to get rid of their virginity... The heroines are shocked by the hero's terrible behavior... but it turns out that they are all in love with the hero...!?