Messiah

The protagonist of the story is Takuto, who lives with a friend Ryouta, due to his parents death. He works part time in a local flower shop, when one day, a mysterious man named Koh (Kou) Haishima comes and starts buying white roses almost every day. He and Takuto get closer to each other, but Takuto realizes there are strange things happening, like the disappearance of his co-worker, which are somehow linked to Haishima. One day, he decides to deliver roses to Haishima's mansion, and Ryouta follows him.
And so the mysteries start to escalate.