My Ninja Wife Cries Easily, Yet Can Kill with One Strike

This is supposed to be a comedy, right?!

I, Agatsuma Zenitsu, an ordinary student at Demon Slayer Academy, transmigrated. A glowing orb started rambling on about man-eating demons, Pillars, and how the world needed more power.

And most importantly, I apparently have a contract! Since when? I seriously have no idea!!!!

But luckily, I met an especially reliable kid with silver hair and blue eyes!

Then I gradually realized...

This world is way too dangerous. Zenitsu trembles in fear every day, terrified that he'll lose his life here one day.

Zenitsu: "Kimarou, you saved me again, didn't you?"

The enemy Zenitsu just took down with one slash: ?

The real Kimimaro, the one who was saved: ?

Kimimaro: "N-no, it wasn't me..."

Zenitsu's eyes brim with tears as he gets worked up: "QAQ It had to be you! Are you trying to get rid of me because I'm useless? Don't! In this cruel world, I would absolutely, absolutely die without you!"

Through a series of misunderstandings, what was supposed to be a duo trying to get by together turns into this:

A stunning boy who can use Ice Release +1

A boy from the Hozuki clan determined to collect ninja swords +1

An incredibly powerful red-haired Uzumaki medic +1

A boy born with the Sage Body who can understand animals +1

A deranged researcher attracted by underage boys and girls, devastated -1 (?)

Zenitsu will also transmigrate to other worlds, including Jujutsu Kaisen and Katekyo Hitman Reborn!

Might go to the Warring States period (uncertain)

Might mainly take place in Kirigakure? This is purely a labor of love; comments are what keep me going.

Theme: The same moon in two worlds