1girl, 31reyo, arms_behind_back, ass_visible_through_thighs, bad_pixiv_id, blue_buruma, brown_eyes, brown_hair, buruma, curtain_grab, curtains, gym_uniform, idolmaster, idolmaster_cinderella_girls, long_hair, looking_at_viewer, shirt, short_sleeves, smile, solo, thigh_gap, thighs, twintails, white_shirt, yokoyama_chika