I Woke up as a Mob in a High School Setting with a Harem Protagonist

After an unfortunate yet preventable "accident", I woke up in an alternate world where I am in a Harem Romance Slice of Life School Light Novel/Manga. A story of how I turned into a mob as I interacted with this story's MC and his harem. I totally hope I didn't destroy the sequence of the story. Or did I? Join Haruto Itachi, as he tried to find his unluckiness with the surrounding harems of the LN's most average and dense protagonist.