![1girl alcohol bikini blue_bikini blue_sky blush breasts cleavage cloud contrapposto day highres hikuushi_series jacket medium_breasts morisawa_haruyuki navel off_shoulder open_mouth outdoors pink_hair red_eyes scan short_hair sideboob sky slingshot_swimsuit solo standing swimsuit to_aru_hikuushi_e_no_seiyaku rating:s score:35 1girl alcohol bikini blue_bikini blue_sky blush breasts cleavage cloud contrapposto day highres hikuushi_series jacket medium_breasts morisawa_haruyuki navel off_shoulder open_mouth outdoors pink_hair red_eyes scan short_hair sideboob sky slingshot_swimsuit solo standing swimsuit to_aru_hikuushi_e_no_seiyaku](/cdn_image/preview/aa/81/aa8160d637c958c61fd6b05c2cd94a9e.jpg)
飛空士」シリーズ, lit. Pilot Series is a series of novels written by Inumura Koroku and illustrated by Morisawa Haruyuki, all of which are set in the same universe. The novels are published by Shogakukan under their Gagaga bunko imprint and, as of March 2014, 13 volumes, spanning four separate stories, have been released.