One day, a young man named Argo, who has led a carefree life in a rural fishing village, receives a letter of recommendation from an unexpected place. It was from an elite educational institution known as the "Knight's College". The reason for recommending the son of a simple fisherman is the special ability of "cartification" dormant in him. And so Argo goes to live in a college of knights in order to learn how to use his ability.
At Knights College, all conversations and movements are done by choosing a card. Each time you receive a new card, it unlocks a conversation, opens up a different route, or increases your liking for a character. The more cards you have, the more places you can visit and the more you can chat.