Thank you for viewing. - Title: Blue Sky - ISBN: 978-4-591-08915-6 - Author: Natsu Hoshino - Publisher: Poplar Publishing - Price: 1200 yen This is a mobile phone novel that was popular at the time. The inside is in good condition, but it is missing the obi (paper band) and the spine has some creasing. It is also possible to combine it with other books.