[Reborn!] Big Brother Conquest System

Seventeen-year-old Tsunayoshi was getting ready for his high school graduation exams when he was suddenly pulled into another world by the [Big Brother Conquest System]. But why was he the one being conquered?

What? He has to raise his younger brother to adulthood to save the world? Being a savior is his mission, not his destiny. Sawada Tsunayoshi complains through wide streams of tears.

World One: Conquered by a certain ninja's younger brother:

A sweet, kind younger brother who's an easy target for bullies and a human pillar / A pitiful younger brother, driven dark by the destruction of his family

World Two: Conquered by a certain pirate's younger brother: A pirate brother who falls asleep halfway through a meal / A brother who's still a bandit / A brother who joins the revolutionary army and loses his memory

Bonus: What do I do when the flamingo brother is determined to become the young master? Siblings must not kill each other.

World Three: Detective Conan: The younger brother is the top killer in a criminal organization / The younger brother of the truly heroic Akai family

World Four: Hunter x Hunter: The younger brother from an apparently normal family ran away from home / Having a twin brother like Illumi is terrifying. (Still catching up on the anime, TBD. If I don't finish it, I'll cut this world.)

(More worlds will be added if I get inspired.)

Back to Katekyo Hitman Reborn: The head of the Vongola family has a dad who's at the bottom of the family hierarchy / Lambo, your spot as the baby brother is in danger.

Note: No CP, just one-way affection aimed at All27.

World order is random and doesn't follow the blurb. The first world is Detective Conan.

Theme: Love the world and protect the people you love most