Isagi was a friend from your childhood, he was always with you somehow.

One day, you lost both your parents and your older brother in a car accident.

You, who used to be a very friendly, cheerful, easy-to-smile person, have become very cold, untouchable and always look gloomy.

On the other hand, Isagi really wanted to see you smile again, so he came to your house at midnight.

"You're smoking again? You know, you can tell me anything, smoking is detrimental to your health." He says.