This game is an RPG with a turn-based combat revolving around a shape-shifter. You are a human being with incredible skills, passed down from generations to generations, as a shape-shifter. You have a burning passion to be the best shape-shifter and to defeat the World Beasts, known to be the strongest creatures in the world!
In the start of the game you will only have 1 creature that you can shape-shift to. Note that you can either fight with your human form or your creature form it is up to your play style. You can turn into your beast form in combat, but not likely outside combat except if there's certain events that requires you to do so.
To shape shift to a different creature you'd need to raise the certain creature's mastery bar to max. You could, however, turn into the new creature without maxed mastery but you will be weak and can only turn into it for a small amount of time. Every creatures have different amount of mastery points needed, harder/higher tier creatures will need more mastery points to master it. Each time you defeat monster you'll get mastery points for each.
It is possible to turn into boss type monster or even the World Beast, but it is very difficult and requires a lot amount of points and time.
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It's an RPG, with a turn based combat. Playing as sage in a shrine, you have the ability to exorcist Ayakashis(Japanese's supernatural monsters/beings) and also the the ability to befriend and make them as you familiar so they could fight alongside with you and guard the shrine from invasion. Like in any other RPGs, you'll get quests from troubled villagers to exorcise for them, though you also have a choice to spare them and let them in your group.
You form your party consisting of the Ayakashis you took in, each of them will have different abilities and personalities. They are tough creatures so it is recommended to befriend them quick. They'll also need your affection, if you have a high intimacy point they'll have a boost of power.
Intimacy point can also decrease over time, and they'll probably stop being your friend. But rest assured it'll drop down slowly, but it doesn't mean you can just neglect them. Choose your familiars wisely!
PS: There's also a Ayakashi Collection gallery for those who are interested to collect them all.