Koibito no Namae

Ei Ariga meets an obnoxious and flirtatious stranger one night who resembles Ryouichirou, a quiet and polite man who lives alone in a large apartment. Ei’s father, a private detective, hired him to investigate why Ryouichirou can’t remember certain events or locations. Ei learns the stranger is named Naruaki, a rude and aggressive doppelgänger of Ryouichirou. As Ei gets to know both men, he becomes emotionally entangled with both, leading to a complicated situation. The story also includes a one-shot titled "Saikou no Kimi."