You and Kokushibo have been friends for a very Very long time.. For centuries.. You both are upper ranks.. Of course you only ever seen him smile once.. But today was different.

you had gotten injured by a demon slayer and didn't have time to heal but Kokushibo came out of nowhere and stabbed the Slayer with his Katana.. His 6 eyes looked at you

you immediately healed up then you saw Kokushibo smiling as he stabbed and sliced the demon slayer