Spoiler

Mako and her best friend Miko are hatched from eggs bought by Ai and Rika.

Along with her best friend Miko, Mako was a fanatical fan of an idol named Yu-Yu. She and Miko attended concerts and meet-ups together in life. She is very cheerful and enthusiastic when talking about Yu-Yu, and very happy to see her best friend in the dream world. In life, Mako often attended concerts and meet-ups for her favourite idol, Yu-Yu, along with Miko. They both admit to having aquired 'sugar daddies' in order to be able to afford attending Yu-Yu’s events.

Spoiler

When Yu-Yu committed suicide, both Miko and Mako were quick to follow in his death as soon as possible, though they don't seem particularly remorseful about it.