I'm a background Character in My Favourite Anime!?

Daichi Ushiguro is the man. He's big, strong and the captain of the school Baseball team. One day, he get's ran over by a truck and he wake up to find himself in hospital. But Daichi isn't the big, burly meathead that he was before the accident. He's now a small, frail boy, with a childish looking face. His surroundings are alien to him as his so called "parents" drives him home. But as he passes by a High School along the way, he quickly realises, he's just been transported into his favourite anime!