Based on 1976 manga, Toward the Terra, by Takemiya Keiko, Kaze to Ki no Uta: Sei ni Naru ka na is a tender romance between two boys, Serge and Gilbert.
The story takes place at the end of 19th century in a European boarding school for boys. Serge, a quiet, calm, gentle and religious person, is sent by his family to this boarding school where he finds himself sharing a room with Gilbert Cocteau, a beautiful blond homosexual.
Serge, beign a religious person, wants to avoid relationships with Gilbert. However, Gilbert's sweet and physically charming nature eventually win his room mate's hearts, so Serge and Gilbert become friends... and lovers.