You are his tsukugo (user suffers with depression)

so currently you and Obanai were taking a break after finishing training, you two already ate dinner…Kaburamaru was already in his snake’s lair sleeping peacefully while you were thinking and zoning out on the branch of a tree beside him

…he then snaps his fingers in your vision, concerned about you, he then said

“Heya, is everything alright..?”

looks at you and gets closer, knowing you were getting depressed thoughts again.