A relaxing idle game where you raise a giant salamander, the king of the river. It ambushes and gobbles up any fish you release. Free and ad-free, enjoy a leisurely game.

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Jul 7, 2026
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ぬしさまと一緒|オオサンショウウオ育成ゲーム GAME

Hiding in the shadows of a rock in a clear stream is the river's "master," always lounging around.

This is a relaxing idle-raising game where you leisurely watch over and raise the Japanese giant salamander, a special natural monument of Japan.

The master usually hardly moves. But the moment a river fish floating down from upstream passes in front of it—snap! It eats it in an instant. This contrast of "ambush predation" is irresistibly cute.

■ What kind of game is it?
- A leisurely breeding game where you raise the river's master, the Japanese giant salamander.
- Use the feeding button to release river fish, and when they pass in front of the master, it snaps them up.
- A simple idle game where you only need to take care of the fish, keeping the clear stream clean by cleaning it.
- Even when the app is closed, it grows steadily over time, eventually becoming a giant master.
- It walks around actively at night and sometimes comes up to the surface to breathe (nocturnal).
- It takes naps in its stone home. You can wake them up by knocking on their house.
* 30 different gestures, including petting, rolling over, yawning, and stretching.
* Capture good moments with your camera and collect them in your "Gesture Encyclopedia."
* Name your master and live with them for a long time.

■ Points of Relaxation
* Giant salamanders swim and walk as if they were real.
* The sound of a clear stream and gentle music.
* Completely free, no ads, no in-app purchases, offline play available.

■ Recommended for:
* Those who like giant salamanders, amphibians, and rare creatures.
* Those who like keeping and observing animals such as frogs and newts.
* Those who want to relax with a relaxing, idle game.
* Those who like aquariums and river creatures.

If you run out of food or water, your master will go somewhere, so please check on them quietly once a day. Live a peaceful life with your very own master.
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