Uh

theres no proper schedule the next chapter will come out in October tho ahhahaha

Is it once a month releasing per chapter?

I strongly think so

As it’s a Japanese manga it gets released monthly in a manga magazine I believe - like Shonen Jump (but that’s a weekly release magazine). And then eventually it gets a volume when enough chapters are available. But I think the volumes come out later so that’s why it’s once a month.
(Before submitting this I looked it up, it’s a monthly magazine called Jump Square! So there you have it )

Thank you so much for the information (༎ ෴ ༎)