Tranquil Koi 鯉の池

Build your dream koi pond in Tranquil Koi, a relaxing idle game. Start with a single pond and fill it with over 100 stunning koi breeds. Raise them, sell them, and unlock rare varieties to grow your collection. Decorate with plants, stones, and ornaments to design your perfect aquatic haven. 100+ Unique Koi – Collect, raise, and trade vibrant breeds. Customizable Ponds – Design with decorations and ornaments. Idle Progression – Your pond grows even while you’re away. Peaceful Atmosphere – Gentle animations and soothing sound. Create a sanctuary, collect them all, and let the ripples carry your worries away.