shokakko
"little but certain happiness" or "small but sure bliss" which is introduced by Japanese novelist Haruki Murakami in 1986.

shokakko, (in Japanese: 小確幸), combined from Japanese characters from sho=“little” + kaku=“sure” + ko=“fortune, happiness or bliss”, which was first introduced by Japanese writer Haruki Murakami in Afternoon in the Islets of Langerhans (ランゲルハンス島の午後, 1986).