The Day I Became Geto-kun

Xiachuan Tong woke up one day to find herself transformed into the great villain of a certain manga, unleashing curses to slaughter an entire city... only to die at the hands of her closest friend.

She returned to the villain's teenage years, then recalled the story and was astonished to discover that the great demon had once been a genuinely good person!

Gentle, kind, always willing to help, standing up to bullies... It seemed every positive adjective could describe him.

Why did Geto-kun go down a path of no return? She hadn't finished the manga, so she couldn't find out what had led him there.

One day, Xiachuan Tong casually picked up a novel from the bookshelf and was shocked to discover that she was a villain, too!

W-w-w-what should she do?! How could she stop two villains from turning evil?

*

Geto transmigrated. When he opened his eyes, he discovered that he had become a girl, and the great villain in some novel, unleashing monsters to slaughter an entire city... only to be killed in tears by his closest friend.

He returned to the villain's girlhood. Through his memories, he learned that the female demon had once been an innocent, cheerful child, too.

Though she seemed spoiled and willful, she was righteous and kind at heart, and possessed an unusually fierce devotion to her ideals.

Unfortunately, he'd only read half of the novel, so he didn't know the specific reason Xiachuan-san had betrayed everyone.

Just then, he received a strange text message that read:

Geto-kun, I've become you. I guess you've become me, too. There are three things I need you to do for me.

1. Pack your things and leave home. Cut ties with my shitty family!

2. Break up with my shitty boyfriend! And give him ten good slaps while you're at it!

3. Go to the manga shop across the street and find a shonen manga called Jujutsu o Kaisen. P.S. This is very important! You can take your time with the first two! You absolutely have to read it! Your future depends on it! Hurry up and read it! Go now! Right this instant, immediately, posthaste! Get moving!

After reading the manga, Geto stood there, stunned. How had he become a villain, too?!

*

Gojo's best friend had changed. He no longer wanted to sling an arm around Gojo's shoulders, go to the bathhouse with him, or wait in line together to buy sweets.

He'd become... exceptionally girly, like a little girl who hadn't come of age. Every frown and smile was full of feminine charm.

“You're not Suguru. Who are you?!”

“I-I really am your genuine, one-and-only best friend, Geto-kun. Don't be so mean, Satoru.”

“...” Gojo wanted to hit this impostor with a Hollow Purple.

Premise: If you keep kindness in your heart, you will do good deeds.