Ema no Gochisou

You'll die instantly if you fall in love?! Hyper lovely death march~♪

Kei is a university student who's popular with the ladies but is never considered to be a genuine romantic prospect. One day, a succubus named Ema suddenly appears before him! Ema claims to have been summoned there because of a contract formed by Kei, but Kei knows nothing about it. Ignoring Kei's confusion, Ema focuses on his mission of "seducing Kei and stealing his soul" and immediately starts trying to have sex with him, but for some reason...?!

(Source: Tokyo Mangasha, translated)

Note: Contains an extra chapter.