Oh No, I've Become the Progenitor of Vampires

After offending the dean's nephew, poor Tsukimi Shigure is assigned to continue working as a music teacher at the remote Cross Academy.

On his first day at Cross Academy, Shigure senses that something is wrong with the boarding school.

Fifteen years later, he sees those inhuman creatures again.

Vampires.

Something possessing Tsukimi Shigure and calling itself the System carries his soul back to the distant past.

To survive, Tsukimi Shigure has no choice but to pose as Aotsuki Yui, the founder of the unrecorded eighth Pureblood family, the Aotsuki clan, despite being human.

When facing the emissary who awakened him:

System: [Slap him.]

Tsukimi Shigure: Sure.

When facing other vampire founders:

System: [Slap him.]

Tsukimi Shigure: (pointing at his own kid) ...Do I have to hit this one too?

System: [This one gets two slaps.]

The affiliated nobles praise his esteemed name, vampire hunters admire his nobility, and other Pureblood families send marriage proposals.

Though Tsukimi Shigure seems to be thriving among the vampires, he doesn't dare relax for a moment. He trembles as he clutches his secret identity as "Aotsuki Yui, the vampire progenitor."

If these vampires discover the truth, they'll suck him dry!

He has to work hard teaching classes during the day and act in his dreams at night. Tsukimi Shigure's schedule is packed.

He thinks he's nothing special in real life.

But little by little, the people in Cross Academy's Night Class begin looking at him more and more strangely...

PS: Tsukimi Shigure and Aotsuki Yui are the same person, one soul in two bodies.

There may be scenes of "I love you, past me," so don't read if that's not your thing.

The System is a doting father (?).

Everyone is a fan of Yui (Shigure). A story where everyone is captivated by him.

Theme: Learn to love yourself so you can love others better