|Castle in the Air 10|
|Cover characters||Koko's Squad|
Castle in the Air 10 (空中楼閣 10 Kūchū Rōkaku 10?) is a dōjinshi by Keitarō Takahashi that was released at Comiket 83 in late 2012. It is a full colour mini art book of guest illustrations including work by Rei Hiroe and huke.