Matilda, Tobia, Katerina and Aleksej are ten years-old children attending the same hockey and figure skating Multisport Center. Matilda has been in love with Tobia since the third year of primary school.
Katerina and Aleksej come from Russia and their unbreakable relationship started when they met for the first time on a plane through the clouds. Their routines are broken up by Agata, a little girl looking like a witch able to get Tobia’s heart. Karim, the son of Bengali immigrants, and his imaginary friend have always been in love with Matilde, so that they decide to attend the same Multisport Center. Things get worse when they receive an invitation to a four-way tournament from a Multisport Center in Moscow.