First‑year student Uka Ishimori seeks a fresh start. During middle school, classmates dubbed her "Rocky," mistaking her quiet nature for a lack of feelings; she was actually shy and introverted. Consequently, Uka endured relentless bullying and lived a lonely, isolated school life. Now she is resolved to change.
In the opening week of high school, Uka is accidentally splashed with lemon soda by classmate Kai Miura—whose cool demeanor contrasts her own. She had hoped for a day, but intervened. After the mishap, Uka is astonished when Kai shows small gestures of kindness, urging her to loosen her shell. Like the soda"s fizz, new thrilling emotions begin to rise. These feelings spark hope for a brighter future for everyone.
