Miya, a keyboardist in the band Aldebaran, awakens to find an unknown man sleeping next to him...! The man's identity is Ritsuki, a music student, who is expected to be a pianist with a promising future. However, the pressure crushes him and he falls into a slump. Miya, who was born into a musical family and has gone through a similar experience, feels compelled to help him...

Notes:
- Includes an extra chapter.
- Includes the one-shot "27star".