Set in 17th-century Lombardy , I Promessi Trichechi tells the love odyssey of Renzo Trichechino (20 years old, impulsive) and Lucia Trichechella (19 years old, resilient) , two young walruses who dream of a future together.
Their marriage is thwarted by Don Pinguino , an overbearing aristocrat convinced he can bend the lives of others to his will.

Forced to flee the village on the shores of Lake Como , the protagonists take different paths: Renzo, overwhelmed by his impetuous nature, finds himself caught up in the popular revolts of Milan, while Lucia faces the fear of exile with faith and silent courage.

Around them move key secondary figures: religious people who embody charity like Fra' Narvalo , corrupt nobles like the Indescribable and common people struggling with daily misery.

When the plague in Milan devastates the region, fate seems to overwhelm all hope: disease and death strike indiscriminately, exposing the fragility and grandeur of the pinniped soul. It is in this apocalyptic scenario that Renzo and Lucia, separately, find the strength to persevere: he learns the value of prudence and moderation, she demonstrates that silent resilience can change destinies.

After years of hardship, mourning and wandering, the two finally manage to celebrate their walrus wedding: a long-awaited happy ending , a symbol of the victory of love over arrogance and disorder.