basically, haruko is a character from this "anime" talked about in the game called attack on giants. Yk ren has a obsession with mc so he knew she liked haruko and that characters hairstyle, so he made his hairstyle like his and even put on the timid and shy act, just like how haruko acts in the show. Also, I keep getting the days mixed up. Was there a day five before? Or like did the creator JUST release it?