Even for a 1-volume manga, the story is very great! This manga is based on a game called Pokemon: Mystery Dungeon Red/Blue. Ginji was annoying and impatient boy at first, when he became a Pokemon (Torchic), he acts like a strong boy with Mudkip. Very impressive. I like that kind of protagonist. But, it''s kinda weird when u defeated that Groudon so easily....but oh well.
