who died actually? the blond or the black hair guy called seiji?
The blond died during the black hair guy's birthday. A year after, the black hair took a trip with the blond guy's soul or if the black hair guy imagined him to be alive then (that's why he is getting looks from people around him when he talks or laughs because he is alone). At the last stop, he confessed how difficult it is to leave while the blond guy's soul tries to stop him. In the end, it was implied that the black hair guy jumped and died.
PLS THE CHATS HAAHAHAHAHAHAH I LOST IT WHEN YUU SAID HE LOOKED DOWN AND CHECKED HIS YA KNOW NSKFKSKC ISTG YALL HILLARIOUS