KOI2 is a score-based arcade game created by the developers of Kissma, where players are required to tap the forehead of their partner as many times as they can before time runs out. A rather bland concept if not for the power-ups, of which there are plenty of it. By collecting a special item you are temporarily bestowed with a random ability to use and a costume change to match the theme as well.

The final score is displayed at the end of each round, which you can then submit to the high score table. Note that the same name cannot appear on the table twice, even when you have acquired a better score than the one already recorded.