Sawada Tsunayoshi went through the Obsidian War, the Ring War, the Future War, the Simon War, and the Rainbow War.
But in the end everyone betrayed him, and Vongola was wiped out.
Sawada Tsunayoshi failed to protect Nana's mother;
Couldn't protect Li Baoen,
Couldn't protect the guardians,
Failed to protect Vongola,
He failed to protect... Everyone he cared about,
So, he went to find Yuko Ichihara,
Back when I was thirteen.
Conception:.