Natsukashii
Etymology
Japanese, 懐かしい, an adjective related to the verb "natsuku" ("to grow fond of, to become attached"). Unlike English "nostalgic," which often carries wistful sadness, natsukashii leans toward pleasure — the delight of reconnecting with a beloved past. It is typically exclaimed on encountering an old song, taste, or place.
adjective · /naht-soo-kah-SHEE/
Warmly nostalgic — describing something that fondly brings the past rushing back.
What it names
The happy, grateful glow of a memory suddenly reawakened, rather than the ache of missing it.
Example
That theme song is so natsukashii — I haven’t heard it since primary school.
Related idea
English nostalgic mixes in longing and loss; natsukashii is usually the warmer, gladder half of that feeling.