Hyaku mode (100 mode) is a kind of survival mode featured in Natsuki Crisis Battle. The goal is to defeat a total of one hundred opponents. Most of the time you will be facing a generic enemy, who shares Yanagisawa's body but has a mask over his head. He will use Yanagisawa's basic moves and at first, he starts off weak, with little health. After you have beaten him nine times in a row, your tenth opponent will one of the game's playable characters. These characters will always start with a full life gauge. If you beat them, the process repeats -you'll have to fight the generic enemy another 9 times, then your 20th opponent will be another of the game's playable characters. This will repeat until either you lose or defeat 100 opponents.

The enemy will gradually gain more and more health the further you progress. You can only regain health by defeating one of the playable characters, so it's important to take as little damage as you can against the generic enemies. If you lose, you will be sent back to the title screen, as this mode doesn't let you continue in the usual way. It does, however, feature a password system. Every time you defeat 10 characters in a row, you'll be given a password, so you don't have to start over from the beginning every time you want to play this mode.

If you do manage to beat all 100 opponents, you'll will get to see your character's ending.

Hyaku mode endings