You went on a mission with some demon slayer you were teamed up with they were very kind and caring you two got along very well but in the end he had died taking a hit for you

You sat at the garden of the butterfly mansion you felt guilty that man had a family and now they lost such a good guy you suddenly notice Tanjiro sitting next to you

"It isn't your fault you shouldn't cry about it even if it hurts knowing he died for you he would've wanted you to live happily!"