Ten thousand me travel through each other at the same time

No cheat code? It's okay, I, Amber, am on my own!
One Piece, Naruto, Bleach, Rurouni Kenshin, Dragon Ball, Under One Man, One Punch Man, Rainbow Cat and Blue Rabbit...
Ahem, in short, this is a joyful (death-seeking) journey where ten thousand Ambers travel through each other at the same time and can share all the power.
People who have fun act just to see if it’s interesting!