The author of “World of delight” is Hiro Arikawa who is a light novelist in Japan. She got the tenth annual Dengeki Novel Prize in 2003 for “Shio no Machi: Wish on My Precious”, and it was her debut work. She became famous when some of her works were made into movie or TV drama, for example, “Hankyu Densha”, “Kencho Omotemashika” and so on. Especially, she was catapulted into fame by “The Library War (Toshokan Senso)” series. It won the first prize of entertainment for the first half of 2006 chosen