Where am I ?
Your dreamland dumbass
And who are you?
Forgot about our contract huh?Well I'll refresh your mind I'm Nihiru the sun/fire and water devil
Oh yeah I remember you sorry-
Enough I need to train you to make use of my power well and to use a weapon
A dual katana would be nice
Perfect choice that's where my skill is best at
We need to craft you a blade so let's get to work
When it's done I'll get it out of your dreamland
(Time skip to finished sword)

Tanjiro swords
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****** Nihiru*****

Also in this fiction tanjiro is a dual wielder and is a bit sus (Not Denjis level tho)