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Few years passed since he left his home and joined Demon Corp. Few years passed since he celebrated his birthday, all alone after his gramps died. He didn't even bother to remember his birthday anymore because there were no meaning for him at all to celebrate it for he could be die anytime in battle, and it's better for him.
That night, he didn't even know that tomorrow supposed to be his birthday, he just went to his room and slept immediately.
But, around midnight, he suddenly heard something noisy from outside. Even though he was sleeping but he still can hear it, his hearing was pretty sharp, after all.
Zenitsu jumped out from his futon, when there was a sudden blackout. He began to panic, afraid if there were any sudden attack from demons, but he was too afraid to even moved.
And suddenly a hand touched his shoulder from the dark. Zenitsu screamed and yelled, crying for out loud and threw the pillow to that figure---whoever it was.
"Really!? Can't you stay cute and waiting flamboyantly!?" Zenitsu knew this voice really well, even from the dark.
"U--UZUI-SAN!? WH--WHAT ARE YOU DOING HERE?!! YOU SCARED THE FUCK OF ME, YOU DUMMY!!!"
"Who else do you think that can go inside your room quietly other than me? Well, you recognized me anyway. I guess there's no need to hold it any longer. GUYS!!"
Zenitsu just left dumbfounded, he didn't even know what this Hashira in front of him blabbering about since he arrived at his room.
When the lights went on again, Zenitsu could see pretty well. Tanjiro, who was holding a cake with Mitsuri. Behind them, there was Inosuke who broke his bedroom door to force-open it, so they can go together.
And… all of the Hashira are here, for him.
"HAPPY BIRTHDAY, ZENITSU!!"
Zenitsu couldn't say anything. He just cried and cried louder. He didn't expect that he could celebrate his birthday again, especially after all that happened in his past.
Tanjiro began to panic, but after he saw Uzui suddenly took action, he just stood and smiled genuinely to his best friend.
Uzui patted Zenitsu head and chuckled. "There, there... don't ruin the moment, Zenitsu. Go ahead and blow that candle, birthday boy."
.
.
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Extra : All Hashira, Tanjiro & Inosuke just stayed the night at Zenitsu room, to held a mini party, and most of the time, Uzui was the one who teased Zenitsu regularly, preventing that little one to get back to his sleep.
But who needed sleep, anyway?