Close fitting female bodyguard

In a lightning strike incident, the doll turned into a beautiful girl named Mia and transformed into a beautiful girl warrior, rescuing the male protagonist Azuchi who was being bullied by hooligans. Mia believed that Azuchi was her lord, obeyed him, and treated him obedientlyHidden emotions arise. However, Azai has always admired his colleague Bing Bing in the company, and in Bing Bing's predicament, he repeatedly showed kindness and eventually won her heart. Where did Mia come from and where did her feelings for Azai go.