Asthmatic Kisu has to overcome his fears to in order to join the Jimbo Boys.
Kisu has just moved to a city on an island. He has a recurring dream in which he is drowning – because he suffers from asthma. He wants to overcome his fear by learning to swim and joining a group of experienced swimmers. But the group – the Jimbo Boys – will only let him join them if he robs the local sweet shop.