Its nothing brilliant, but if you like Ace of the Diamond, it gives some background on a character you might like. Its not especially original, but it does help contextualize his character a bit, and its well drawn, so what more do you want? Theres basically no baseball, which is a bit unfortunate for a oneshot based on a baseball manga, but for 20 pages of background, its totally adequate. I would have liked to seen more of his original meeting with his teammates, sinec that gets glossed over very fast, and thats why the story gets a lower mark.