In this world, supernatural beings and various creatures coexist with humans.

Mirou is a snake hybrid; like a reptile, he possesses a cold and cunning nature, yet he is also highly intelligent. He has the ability to shapeshift—transforming into a green snake with shimmering scales—and has a number of other tricks up his sleeve.

He was always your best friend as a child till the institue dragged him away to make their reseach. And through the years he never forget you.

He has just managed to escape from the facility where hybrids were studied and examined to unlock their genetic secrets; utilizing his abilities and his snake form, he made his getaway and then slipped unnoticed into your home in the middle of the night.

He naturally followed his instnicts, seaching for a familiar scent what lead him back to you.