I've really been enjoying this game and its probably my favorite take on single player fighting game experience. I Think I've done pretty much everything in the game besides catching all the fish. However I can't for the life of me figure out how to unlock Matsu as an assist without using debugging tools. I've noticed that the samurai at the far right of the map uses her as an assist but I genuinely think I've tried everything my smooth brain can think of with this lead.  I was wondering if I was missing something or if she's even obtainable legitimately at this point in the game. 

P.s. I've been playing this game using my arcade stick and I just wanted to add that it feels great! 

ty!! Matsu is only available as an assist through debug tools currently, I've been wanting to put her in a special place, but it might make sense to have her more easily available while everything is under construction. She can be found as a boss in a specific secret area, but can't be asked out. As far as the fish, only one suit of the fish (Ayu) are currently available (so, the top row of the fishing page).

This is actually reminding me that I should probably have a spoilered checklist of things to do for people to check to see if they've gotten everything already, because there are some secrets, usually trying out interactions to see how they feel in a larger scope.