Akiyama's sub-stories often revolve around his role as a loan shark, helping people in financial trouble, or dealing with the various eccentric characters who frequent his establishment. Many of these quests involve light combat or simple fetch tasks. For example, 'The Homeless Man's Request' involves finding specific items for a man in the park, while 'The Debt Collector's Debt' sees Akiyama helping a fellow loan shark.
One notable sub-story for Akiyama is 'The Master's Legacy', which unlocks his training with Master Komaki, granting him access to powerful new Heat Actions and combat techniques. complete this as soon as it becomes available. Other sub-stories might involve helping hostesses, dealing with street gangs, or even participating in a bizarre fashion show. Keep an eye out for blue exclamation marks on your map, as these often indicate a new sub-story is available.