High school student Kanata Kurosaki leads an unremarkable school life.

One rainy day, his cold having worsened, Kanata collapses on his way home from his part-time job.

「Are you alright?」

The one who came to Kanata's aid was Shion Yumekawa, a beautiful girl known as the "Sleeping Princess" for always dozing off at school.

「A sleepover with a friend is so exciting, isn't it?」

「Since when did you and I... become friends?」

By a twist of fate, Kanata ended up spending a night at Shion's house.

Their relationship was supposed to be just for that one night, but...

「Will you become my co-sleeping friend!?」

「A co-sleeping friend? What's that?」

「Um, it's just a friend for co-sleeping.」

「...Huh?」

From then on, Kanata began regularly co-sleeping with Shion.

「I'll prepare breakfast right away, so please wait for me.」

「Shall we have a study session together?」

「Going out, just the two of us, it's just like a date, isn't it?」

Huh? You said it was *just* co-sleeping, right?

This is an extra-sweet romantic comedy about a lonely, gloomy protagonist who, while co-sleeping with a silver-haired, polite, caring, yet clumsy beautiful girl, gradually develops an unbreakable bond through their (unconscious) budding romance.

☆Since a large backlog of content has been prepared, daily updates are planned for a while.