Isekaid 40ish Man Returns, Regressed as a Peerless 17-Year-Old

When I returned home after making a “contract” with Yui, I found the apartment window lit.

It was a corner room in a small, 20-year-old, two-story apartment building.

That is where my little sister Futaba and I live.

My parents told me that the repayment loan is quite difficult to deal with but it was paid before I knew it and I was not even demanded to pay the administrative fees.

And I’ve never found it strange.

This must have been the result of the world forcibly compensating for the environment of a person who had been eaten up by causality.

「I’m home」

How happy I am to say “I’m home” and how happier I will be if someone says “welcome home”.

「Hey oniichan, where have you been? I’ve already cooked dinner. You’re from the go home club so you should at least make dinner for me.」

My little sister, Futaba, came out of the kitchen.

She’s nagging and often poisonous to me but she’s an important member of the family.

Speaking of which, I don’t remember hearing the words “welcome home” from her since we started living together….

She’s short and her face is even smaller and cute. She turns her grumpy face while her long twin tails shake.

I heard that she’s quite popular because she’s cheerful and polite outside.

The reason why she doesn’t look like me is because she’s my adopted little sister.

Futaba should be aware of that.

「Understood. I’ll cook for you tomorrow.」

Futaba, who’s the president of the naginata club, is often late to go back home.

After club activities are over, she goes to a nearby dojo.

She’s a promising athlete who has won a national championship.

「Yes yes. Oniichan’s cooking can make someone hospitalized—-eh? Cook!? Oniichan will!? That same oniichan who’s a total loser at housework!?」

Do you have to say that much!?

I’ve lived alone for nearly 20 years. Thinking about it, I couldn’t remember why I started living alone.

It wasn’t that my job location was far away.

It was not because Futaba left me.

I was living alone in this apartment.

No way, could Fataba have been….

Damn it! How much of a coward had I lived before to not know anything!

「O-oniichan? What’s wrong? Your face looks scary. If you don’t like it that much, I’ll cook for you.」

She’s not always nice but this kindness of hers is one of her good points.

「I’m sorry. It’s nothing. Let’s have dinner.」

「Oniichan….?」

Not only Yui. I want to protect Futaba as well.

And I have the power to do that now.