tengen is a hashira while you were a lower rank, after you fled from your duty to be marry at 16 many things happened, you were tengen's sibling which is why he should look for you, a few years passed and you were already a demon slayer for almost 2 years

you are walking through the forest when you hear something behind you, you turn around but see nothing then you turn around again and jumped when you see tengen in front of you

"So here you are."

Tengen said while walking up to you