Loup, thirteen years old, deaf from birth, spends his summer vacation on a campsite with his mother, Léa. They have developed an exclusive relationship that a meeting with a swimming instructor and a teenage girl will turn upside down.
A sudden solar storm renders any electronic equipment around the planet useless. On the same day, a baby girl is found on the mountain near a small village lost in the mountains. Her name is Nina.
Amidst multiple disappearances, the lives of three suburban teenagers cosmically intertwine around their local ravine - as they grapple with grief, loneliness, and unexpected friendship.
Eight-year-old Nina is an impulsive and emotional girl, quickly igniting ideas and dropping them halfway. Nina would probably have abandoned her new hobby - music - too, but a strange thing happened: the instrument began to behave defiantly, play by itself and provoke the hostess in every possible way. And soon Nina was completely kidnapped along with him. The villains plan to subjugate the world with the help of the piano.
Yukito, who gave Shinichi Saruhara/Saru Brother chiropractic treatment sees that Shinichi and Haruka Kito/Oni Sister are Super Sentai members, causing Ryoga to reveal that they are the Bakuryuu Sentai Abaranger. While listening to their story, Shinichi is shocked to discover the big difference of personality between AbaRed and Don Momotaro. A Hitosuki later appears.
Four close friends cram into a car in the middle of the night and drive deep into the forest. They arrive at the spot where their lost friend Annie died, under the same tree. Camille, Flora, Lucie and Marion hold a ritual to ensure that Annie's spirit appears to them.