Kimi no Iru Sekai Shika Iranai

Futaba's lonely childhood was brightened by Yuki, a kind and pretty boy who always appeared to comfort him. After Yuki kisses him and disappears, Futaba grows up still holding onto that memory. Years later, his father announces that his older step-brother, Kazuyuki, will be living with them.

Futaba is overjoyed to discover that Kazuyuki is the same Yuki from his past, but the reunion is far from warm. Kazuyuki is now cold and distant, leaving Futaba confused and hurt. When Futaba witnesses Kazuyuki having sex with a girl, he realizes his own feelings are romantic, but Kazuyuki's next words only deepen the rift between them.