Bocchi the Rock!: Futari Gotou's Big Sister Observation Diary

Bocchi the Rock!: Gotou Futari no Onee-chan Kansatsu Nikki | Bocchi the Rock! Episode 11.5, Bocchi the Rock! Recap | Bocchi the Rock! Futari Gotou's Big Sister Observation Diary

This is a special program where we look back on the recent daily life of the main character, Hitori Gotou, from the observation of her younger sister, Futari Gotou. (Source: Bocchi the Rock! Wiki)