I just finished reading "No longer Human" by Osamu Dazai and I'm a bit confused

Great book,love it a lot.But,in the epilogue the author makes up this story where he meets the madam of the bar in Kyobashi and then the madam of the bar calls Yozo an angle(the last line of the novel). That's where I'm confused because since it's a semi autobiography did Dazai call himself an angel or just Yozo the character an angel?And if he did,why??