How My Friends' Party Made Me Into a Harem MC

Michael the main protagonist of the story who wishes to have a relationship to his high school crush, then as he confessed to her, she dumped him since she already had a boy friend, as he was depressed and sad, his friends wanted to cheer him up and planned to invite him to a party at one of his friends house. And as the party continues he suddenly gets dizzy then blacked out. As Michael woke up at the next day he was surprised on how he ended up in his bedroom.... and how a girl is also lying next to him and told him that she was "one of his" girl friends . And as the day progresses four more girls also told him that they were his girl friends... And as the five mysterious girls were now altogether they asked Michael to choose only one of them since that was his "promise" to them at the party.. now how will this "Harem MC" handle this kind of story