1girl bikini blue_hair blush content_rating cover cover_page dixie_cup_hat doujin_cover from_below groin hat highres idolmaster idolmaster_(classic) kisaragi_chihaya midriff military_hat navel nomura_teruya non-web_source outdoors palm_tree purple_eyes sailor_bikini sailor_collar sailor_hat sailor_swimsuit_(idolmaster) shiny_skin solo swimsuit tree white_bikini