This is the first title by piriri!, a sister brand of UnisonShift, Hearts and Qoobrand, under the AMUSE CRAFT company. It is said that one who graduates from the famous private school Kamishiro Gakuen will definitely become successful in life. The best students at the school are called ‘knights’ and are admired by all. This year, five good childhood friends were selected as the ‘knights’: sourpuss Yukitaka, serious Kei, cheerful Ruruka, timid Asuna and cool Touri. Even though he had some feelings for all of them, he spent his days without pursuing any deeper relationships. That was until he found out about a secret ‘duel game’ which only the knights can participate in.