Two-Faced Princess - Chapter 65

The story is about a boy entering high school, who answers a strange call from a public phone one night. The caller challenges him to a bet: She’ll remove the birthmark which he sees as the cause of so many problems, and he’ll have fifty days to win the heart of a girl he’d considered far beyond his reach. And with this, a very strange summer begins.

The celestial celestial beings who lived for more than 100,000 years were born and reborn in a small monk in a human world.
His motto: “It’s not as good as a medicinal medicine for ten years of hard work.” “Even if you practice a copper-iron bone, it’s not enough for my soldier’s attack.”

- Description from Novelupdates

A polite and lethargic boy was reincarnated in another world as a vampire bishoujo.

I can see ghosts.Even the ghosts inside games.But then…”Ah! Not there, over that way! My family heirloom is hidden there.”The ghosts in the game keep revealing hidden pieces to me.