The 40K Ending is unlocked when you reach a score of at least 40,000 or greater in a single game. The player will also be greeted with a Red-Eyed Irisu Kyouko when the game ends. This will unlock a small cat at the lower right corner. Clicking on it will unlock the game's Metsu mode. The photo in the directory is also changed, Age Hatori being erased.

Photo (50000)

The photo as it appears after reaching 50,000 or greater in a single game.

Under 50000

A player with a score slightly below 50000 but has Metsu Mode available.