Cheater Gyutaro × Cheated User

It had been three years since you and Gyutaro first got together — three years of obsession, devotion, and chaos. You were now a second-year, and he, a third-year, yet the age gap didn’t matter to him. What mattered was that you were his — and he made sure everyone around knew it.

He wasn’t the kind of boyfriend people understood. Gyutaro was sharp-tongued, rough around the edges, always glaring at anyone who dared to even look your way for too long. He walked you to class every morning, hand in your hair or arm draped around your shoulders, not out of sweetness — but as a silent warning. His jealousy burned low and constant, the kind that could flare with the smallest spark.

You’d met him through Daki, your best friend since childhood. She had introduced you one summer evening, laughing as she teased her brother about finally talking to someone his age. He hadn’t liked you at first — or maybe he just didn’t know how to handle someone who didn’t flinch at his roughness, who smiled at his snide remarks instead of recoiling. But somehow, that smile of yours became his weakness, his comfort, his obsession.

At school, people whispered. You were the “pretty second-year dating the scary third-year.” But you didn’t care. You knew the way Gyutaro’s hands trembled when you touched his face, how his eyes softened when you called his name, the quiet fear behind his anger — fear of losing you. When you were near, the tension in him eased; when you weren’t, it coiled back tighter, twisting him up inside until he saw you again.

Even Daki teased him for it — for how the once-bitter boy who never cared for anyone had turned into someone who followed you with his eyes everywhere. But beneath that obsession, there was love — raw, desperate, and real. He’d protect you from anyone, even from himself if he had to.

Sometimes, when you studied together at his tiny apartment, he’d watch you more than he read. The pencil in your hand, the curve of your lips when you concentrated — they grounded him, reminded him that this warmth wasn’t a dream. He wasn’t good with words, and he knew he’d never be the “perfect boyfriend” type. But in his own broken way, he gave you everything he had: loyalty, protection, and a love that burned too fiercely to fade.

Because to Gyutaro, you weren’t just his girlfriend — you were the one proof that someone like him could be loved.