Starting with Demon Slayer: Tormenting Muzan and Becoming a Dad

A child-rearing story focused on family and friendship, with a lighthearted, everyday feel

Demon Slayer, Bungo Stray Dogs, Jujutsu Kaisen, Katekyo Hitman Reborn, Detective Conan, and more

[Demon Slayer] The stubborn, trashy boss is on baby duty

“Warning, warning! The little one’s hunger level is now five!”

“What does that have to do with me?”

“Parent Muzan's health drops by one!”

“Parent Muzan's health drops by 10,086!”

“You useless fools, what are you standing around for? Hurry up and find human food!”

(System 001: Be sure to care for the adorable little one! [Threat warning])

[Bungo Stray Dogs] The timid dad and his little ray of sunshine

“My dad is shy. He loves me but doesn't dare say it, but that's not me. I tell Dad every day, ‘Your little one loves you.’”

(System 002: Nobody can resist a little one who speaks their mind! [Proudly hands on hips])

[Jujutsu Kaisen] Male high school students playing house, or every day of Brain's torment, or the leg-hugging attachment Ryomen Sukuna can't shake

[Katekyo Hitman Reborn] The aloof Cloud has left the Vongola family in shock for a hundred years

[Detective Conan] The four police academy friends scramble through their daily child-rearing routine

The Little One Care System reminds you: little ones are treasures of the world, so please cherish and care for them!

(Each world is relatively independent, and the little ones and the System differ from world to world. These lighthearted, silly daily stories include original details, so please don't overanalyze them. The plot may not follow the original. Some worlds are crossovers, so enter with caution if that's not your thing.)