More info: https://dlraw.net/%E3%83%80%E3%82%A6%E3%83%B3%E3%83%AD%E3%83%BC%E3%83%89/Artbook-%E3%83%95%E3%82%A1%E3%82%A4%E3%82%A2%E3%83%BC%E3%82%A8%E3%83%A0%E3%83%96%E3%83%AC%E3%83%A0-%E8%A6%9A%E9%86%92-%E8%A8%AD%E5%AE%9A%E8%B3%87%E6%96%99%E9%9B%86-Knights-of-Iris/ ---