It is a black and white manga or manhwa it wasn't coloured. Mc is working in his office and talks to a girl and some other people the the world starts to change he then goes outside and finds a minotaur on his way home and dies then starts the day again with a status window and goes to another pl...

In Cromartie High School, an old man occasionally appears in the sky: No one ever comments on this, so presumably it's only we viewers who see it. Who is he, or what is it a reference to?