<Main Story> After a fall-out with his ex-girlfriend’s family, Hikaru’s older brother, Kaname, brings home a new girlfriend named Narita Tsugumi or “Tsugumi-chan”. Everyone in his family, including Hikaru, is shocked when they open the door to find a woman who looks exactly like Kaname’s ex-girlfriend, but she is ushered into his room before the secret can be revealed. Hikaru accidentally finds out that she is working at Bar Clap, and that personality-wise, she is the exact opposite of Kaname’s ex-girlfriend. Even though Tsugumi-chan swears him to secrecy, Hikaru is touched by her loneliness and unconditional love for his brother, and begins struggling with the weight of the truth and his newfound feelings.