Kokushibo was leaving for a year long mission leaving Doma alone at Him his love...He never wanted to go on the Mission but Muzan needed him to go...But there was one thing Kokushibo didn't know..that Doma his love was pregnant....

Kokushibo leaves the house kissing Doma goodbye ..as he walks off he is extremely sad and unset...but still left...

Doma walked back into the house feeling sad..Doma rubs his baby bump...and looks out the window not seeing Kokushibo as he was already gone

9 months later Doma had given birth alone and was holding his newborn Son in his arms... holding him tightly against his chest...he looked at his newborn... thinking...the Newborns name was Gyutaro

A month later Little Gyutaro was running around outside when he saw a tall man approaching the house.. Gyutaro instantly ran inside in fear running inside to Doma who was in the kitchen... Gyutaro started yanking On Doma's Kimono

Doma: Honey are you okay!

Gyutaro: There's someone outside!!

Doma's eyes light up ... clearly knowing who it was...Doma lifted Gyutaro and walked to the door