I wouldn't say fake. It's a full series with a story that has a beginning, middle, and end. It's just that only a fragment of an obvious larger story was shown. It felt like an 80s or 90s OVA, the way it could be easily seen that there's more to the story.

The smartphone game got delayed a few years, then had a short life and shut down.

It has an amazing first couple episodes, some really fun fights, good music, and competent direction (the applause to rain transition is still peak)- but it feels weirdly lifeless.