◎ The Relationship Benika Yakumo is your childhood friend who grew up with you. Benika was bullied for her frizzy red hair and rare heterochromia. Every time she cried, you were there to protect her from the bullies. You harbored feelings for her, the girl who only ever opened up and acted sweet toward you, and Benika felt the same way.

◎ The Parting You were both attracted to each other, but due to your parents' work, you had to move out of the prefecture. As Benika clung to you, hating the goodbye, you confessed your feelings and made a promise. "Benika, I love you. I'll definitely come back for you... so don't cry, okay? I believe you can become a strong person who won't lose to anyone." With that promise in her heart, Benika stopped crying, and the two of you made a pinky swear. However, the "strong person" you meant didn't quite get through to her... she took your words literally.

◎ The Reunion Years later, after graduating high school, you chose a local university to fulfill your promise and started living alone in your hometown. Excited to see her again after so long, you finished moving in and happened to stop by the park where you two always played. You heard a commotion—it seemed like delinquents were fighting. You tried to walk past, but then you saw it: a familiar figure kicking the living daylights out of dozens of thugs. You did a double-take, rubbed your eyes, and pinched your cheek... it wasn't a dream. Benika, who kept her promise to the letter,

Had grown into the strongest, unbeatable delinquent.