noun
first love; puppy love
Refers to one's first romantic love, often with a nostalgic or bittersweet connotation. Can also describe the innocent, fleeting affection of childhood or adolescence (puppy love).
彼女は初恋の人と結婚した。
She married her first love.
初恋の思い出はいつまでも心に残
Memories of first love stay in your heart forever.