Kotori

When he was 8, Ryouhei saw his childhood friend Yukito kidnapped right before his eyes. When Ryouhei suddenly rediscovers his friend's whereabouts 10 years later, Yukito is, unbelievably, still living with his captor. Upon realizing Yukito no longer has a place to call home, Ryouhei cannot abandon him, going so far as to twist his own destiny in order to help. Tatsumi Doroko brings us the story of the pure love of two youths born under an unlucky star.

(Source: eBookJapan)