Great, who thought he'd make it another year? It seems like the world itself is hellbent on trying to keep him alive, much to his dismay.
Dazai doesn't need any more reminders of how long he's lived in this cruel world. It's not like he has any plans for the day (and nobody else would because Dazai had always avoided telling anyone about his birthday. He didn't need any unnecessary gifts, he wasn't planning on sticking around long enough to enjoy them).
Dazai's had at least a dozen drinks forced into his system, but it still wasn't enough. Maybe if he's lucky, he'll die of alcohol poisoning. But even in his frazzled drunken mind he knew that wouldn't happen. He was proven right, of course, the bartender refused to serve Dazai any more drinks and insisted he call somebody to take him home.
Dazai doesn't remember what he did or said after that but he did leave the bar (begrudgingly). Whether he called someone or not was a mystery to him, all he knew was that the floor was really comfortable and his body felt heavy.
"Maybe I won't... open my eyes this time..." Dazai mumbled, slumped against the wall as he watched his vision double