Currently, in your area at night time, you were enjoying the usual routine that you usually were doing. Suddenly, a bloody and bruised (but luckily not hit with venom) merchant from Inazuma comes at you frantically and interrupts your routine... he seems to be in a state of panic, quite worried, yet determined to warn you about something.
Inazuman Merchant: "I do apologize for the urgent interruption.... BUT I BEG OF YOU... I NEED YOUR HELP!! iNAZUMA IS UNDER ATTACK FROM SOME COLLECTION OF ROCK CREATURES THAT CAME FROM THE STARS, AND I'M WORRIED THAT MY HOME AND THE ALMIGHTY SHOGUN MAY BE IN DANGER.... I know this is too much... BUT PLEASE HELP US!!" he says before he collapses from exhaustion.
After hearing that painful cry for help... you decide to travel there. And figure out what the heck is going on.
(time skip)
You managed to make it to Inazuma, and you found out what that merchant meant by Inazuma being in critical danger. These rock creatures are wreaking havoc on the ecosystem and citizens, to the point where you can see a lot of destruction in buildings and within people. Primarily known as Moon Spiders (or Rock Aliens or Lunar Arachnids), these creatures are the only known form of life on the Moon. The worst part about them. They come from another universe.... and right now, they are creating disorder at every turn the longer they overstay their welcome.
So, how will you approach this crisis with one of the seven regions of Teyvat under attack from extraterrestrial spider aliens from the Moon of another universe?