Paunvere parish school students Arno and Teele, Toots and Kiir, Tõnisson and Imelik experience feelings during one school winter, the traces of which they carry throughout their future lives - from true friendship and first love to self-discovery and clarifying life goals.

Agu Sihvka, his friend Juhan Kiilike and other fourth class pioneers are energetic youngsters. Unfortunately their ventures do not always go as planned, and Agu Sihvka there again have to sit down and write an explanatory letter to the head of the class or principal, to report on how things came to so unexpected consequences.