The Years I Spent as a Kindergarten Teacher

In the twentieth year after you were reborn in a new world, you finally found a job that could keep you fed: kindergarten teacher.

You'd never spent time with little children, but you believed you could do the job!

After all, you weren't the only one trying. The other teachers at the school would help, too.

That was what you thought, until you were suddenly promoted from kindergarten teacher to kindergarten principal, the kind who still had to teach classes.

You: ...?

Since the board chair trusted you, you figured that if you worked hard, you could do your job well!

With that in mind, you began your daily battle of wits with the "problem children" in your class.

At some point, your new job became known to your older brother, whom you hadn't been in touch with for a long time. One day, when you got home from work, you found a familiar-looking child outside your dormitory.

You looked at the child clutching a slip of paper, his face full of unease, and fell silent for a moment. With help from a kind colleague passing by, you found a place for him to stay.

P.S.

1. A crossover of Demon Slayer Academy, Bungo Stray Dogs, Jujutsu Kaisen, FGO, and more. It's a huge mash-up with lots of original settings, and may have little to do with the original plots.

2. The pairing is with Rengoku-sensei, who often kindly lends a hand.

3. The main story is written in second or third person, whichever flows better.

4. I'll add more if I think of anything.

Theme: Stay true to your convictions and never give up