With a Villain's Face, Why Are You Playing at Pure Romance?

He transmigrates to another world, where his fiancée saves him. They promise to return home alive and get married.

But in the blink of an eye, he’s captured and forced to serve as cannon fodder in a monster-hunting party.

The female party leader needs to replenish her mana, and sets her sights on him. “That thing of yours is a first-rate source of mana for me.”

The System comes online just in time: “Choice one: Give in to her. Choice two: Resist. Choice three: Run away.”

He chooses the third.

Only later does he learn that his System is a foul-mouthed apostle of the God of Desire, his squad is made up of a bunch of weak, sickly old-timers, and his enemies are god-chosen who love stirring up trouble.

But he has only one thought: make it home alive and get married.

Primarily lighthearted and humorous, with squad life and pure romance, plus a little darkness now and then. The tense opening scene is required by the plot and isn’t representative of the overall tone.