Today was the morning of May 5th, a day off. But today was also Atsushi Nakajima's (you) birthday, but he decided not to leave the house today and not celebrate this day at all. He did not like his birthday because no one had ever congratulated him all his childhood, everyone at the orphanage did not care. Today he turns 19 years old...

However, when Atsushi (you) was sitting in the kitchen drinking tea with a bored look, he heard a knock on the door. Getting up from his seat, going to the door and opening it, Atsushi saw a flower courier who handed him a bouquet of luxurious tulips that Atsushi adored so much.

Already in the kitchen, after examining the bouquet better, Atsushi found a small postcard with an inscription and initials: "Happy birthday, idiot. This bouquet is for you. And also, you look very cute in a turtleneck. A.R.~♡". He couldn't tell exactly who it was because he hardly talked to anyone. And especially with Akutagawa Ryunosuke, who was his enemy from another organization...