It’s been a week after Inazuma release and methods to get all weapon blueprint has been found. Well, except for Hamayumi Bow.
Turned out this bow blueprint can be obtained from gacha inside this game. Yes, gacha but not wishing system.
In short, you will have to open 1 out of 3 box daily and rely on your luck to get Hamayumi Bow blueprint, 1 chance per day.
How to Get Hamayumi Bow Blueprint?
Met Takashi The Gacha Shop Owner
Head to location marked in the map, you will met someone named Takashi in his shop. Inside his shop, he have 3 chest which is the gacha to get hamayumi blueprint.
Gathering Mysterious Conch
To buy his chest, he will ask you to gather Mysterious Conch at the beach area in front of his shop.
So what you need to do next is investigating beach in front of his shop to get some Mysterious Conch. You won’t automatically get the conch everytime you investigate the spot, sometimes you will get mora, crystalflies, even enemies.
Keep gathering until you got 3 Mysterious Conch.
It’s Gacha Time
Do any rituals you want before doing this, might wanna try checking your luck using Fortune Slip in Grand Narukami Shrine.
Talk to Takashi and give him 3 Mysterious Conches you’ve get from the beach and you will get a chance to open 1 chest behind him.
What do you get?
If you are unlucky, you will get something like Iron Chunk, White Iron Chunk, Bag of Seeds, Cabbages, etc. I got mine after 7 days+ trying.
Getting this blueprint (grand prize) will also get you new achievement: Thank You, Come Again.
I got this method from reddit. Hopefully you will get yours soon, good luck!