Exploding in popularity with the anime! The music manga "Bocchi the Rock!" has its first official spin-off! The protagonist is Hirai Kikuri (25 years old). In the main story, she is affectionately called "Onee-san" by Gotou Hitori, known as "Bocchi-chan." Originally an introvert, she has become a charismatic figure through her band activities. Now, she has a deep love for alcohol and often gets drunk. What is her daily life like...!?