Katakiri Yuichi (Ryo Yoshizawa), who was born in a poor family but has a very kind heart, Mikasa Tenchi (Yamada Yuki), who has a super high IQ and ranks among the top in the class, Sawa Ryogi Shiho (Uchida Rio), who is full of justice and can't stand all unfair things, Kokoro Yuto (Nemoto Kaze), an introverted otaku who likes the second dimension culture, and Shibu Makoto (Kubota Yura), a young master born with a golden spoon in his mouth, are good friends who study in the same class. One day, the class fee for the off-campus teaching trip was stolen, and the person who stole the money was among these five. The lost money was used to pay the registration fee, and the five were involved in a competition called "Friend Game". Ironically, if they want to become the final winner of this friend game, they must betray each other.