They have many things in common, such as liking the same perfume, having the same hairstyle, wearing the exact same school uniform... And the same gender. I guess this is why they become good friends. Sometimes I often think that without that emotion that the world cannot understand, maybe they would be like other friends in the world, living a planned life quietly, but you can never say never, and never say 10 million, because all this is far out of your control...