[Crossover] Whose Hailstone Became a Spirit?!

Blurb:

During a mission, Nakahara Chuuya, the Port Mafia's gravity manipulator, picked up a tiny girl who was a full half-head shorter than him. From then on, Nakahara Chuuya had a little shadow who followed him wherever he went.

Whenever he went on a mission, the girl would obediently wait behind him.

Until one day...

As Nakahara Chuuya fought an enemy ability user, a small-time thug at the back of the group whispered to his companion, "What do you think it means that Nakahara Chuuya brings a little girl with him every time he fights? Does he look down on us? Is that it? Is it? Otherwise, why bring a delicate little girl along?"

The delicate little girl in question raised her head and looked over at him. She lifted her right index finger and gently pointed downward. The next second, a huge hailstone fell from the sky, smashing into the ground in front of the man and leaving a hole a meter deep.

The chill from the hailstone made him shiver.

One small-time thug, so scared his legs were shaking: S-sorry, I was wrong. You're the boss. As long as you're happy!

*

Among demons, there was a rumor that no one should ever mess with the two members of the Demon Slayer Corps who didn't carry swords. Everyone had heard of Nakahara Chuuya's strength, but nobody knew anything about Aoki Rin.

They just assumed she was someone under Nakahara Chuuya's protection.

One demon shook his head when he heard that. "No, no. I heard that little girl is actually a hailstone spirit. She can conjure huge hailstones out of thin air and pin you down with them, then watch you burn to death in the sun."

The demons: ...

Later, word of this reached Aoki Rin, the supposed hailstone spirit. The little girl was so angry she stamped her feet and put her hands on her hips, looking just a little bit... fierce?

"You're the hailstone spirit! Your whole family is hailstone spirits!"

"I've told you, I'm a god! A god!!!"

Standing behind Aoki Rin, Nakahara Chuuya looked at the crown of the little girl's head and, fully content, ruffled her hair. Even his voice was gentler than usual. "There, there~"

※Note added on 2020.3.22, screenshot saved

※Inspired by the hailstorm this morning

※Planning to start this after finishing the Nichirin Sword story. If you're interested, please add it to your favorites first!