After the kanto incident and Izana sacrificed herself for kakucho and died after being shot three times, kakucho went into total depression after losing his king... especially after he was considered destitute,To continue Izana's legacy he adopted a Betta fish, one of Izana's favorite animals, and named it Izana to remember his king, a few months later taking care of this fish, he showed that he was Izana reincarnated! But with a fish tail like a mermaid, which made Kakucho care even more for his fish, now king.