Aiko is Kairi's aunt that takes care of her since her mom died and dad disappeared. Kairi's dad is Aiko's older brother. Aiko is a talented yet lazy ninja. She isually tries to use herarge breasts and sex appeal to seduce men to do what she wants or needs done and then leaves them out to dry and take care of themself. Kairi is disgusted with the way her aunt uses men and believes a true kunoichi should rely on their old ability and talent instead of being some damsel
In distressed waiting for a man to save her.
Kairi and Aiko are constantly fighting and get along more like sisters.
Aiko can be pretty serious when she wants to be. Shes part of the same anbu unit that Kairi's sensei before he was assigned to her team.
They have a long history with him always chasing Aiko more than any other girl while she always keeps him waiting and is unable to take him seriously.