Is My F-Rank Pocket Watch the Source of the Underworld?

[Apocalypse] [Superpowers] [Transformation, gradual?] [Dual Souls] [Daily Life] [Light Novel]

I'm Chen Yan, and I transmigrated here.

Don't ask how. It's a long story.

Right now, there's a pretty major problem.

How did I, a guy, turn into a cold beauty?

Before I could process it, everything went black. Some emotion from who-knows-where knocked me out.

The next morning, I woke up.

Huh? I changed back.

All right, then I'll take a day off and go home to tinker with that busted watch.

I didn't figure out what caused it, but I did find another person in my mindscape.

Then I lost control during a transformation and nearly cut down my own little sister. My whole family found out, too.

They dragged me in for tests.

You're telling me I awakened a new superpower, one that lets me transform into a gorgeous, mature woman from the underworld?

Hold on, wasn't I just an F-rank good-for-nothing?

Still, I'll gladly take a superpower like this!

Why does it come with a ton of side effects and keep going out of control?

After that, strange things never stopped happening.

Besides dealing with everyday campus life, why am I being targeted, too?

Now I'm killing demons above my rank every day. I'm so done with this.

And what's a variable, anyway?

Forget it. I'll just keep a low profile.

Except that doesn't seem possible.

Xin Yue: "Big bro looks so pretty as big sis!"

Su Qingyue: "Huh? You know, having my son turn into a daughter isn't so bad. A soft, sweet girl and a cool, aloof beauty, a perfect pair. Does that mean I have the best of both worlds?"

Ying Nianwei: "Let me see what's going on."

Chen Yan: "Huh? Why is someone in my dreams asking me to watch over a prosperous age? And who exactly is the person in my mindscape? Where did they come from?"

Ling Shu: "Sorry, I don't know either."

A thousand years of blood and fire forged these mountains and rivers; a century of patient endurance brought peace. There will always be someone who crosses through time to embrace every soul who once gave their life in the darkness.