1girl, arm_behind_head, arms_up, blue_sports_bra, blush, breasts, brown_eyes, brown_hair, character_name, cleavage, closed_mouth, hair_bun, hair_tie_in_mouth, idolmaster, idolmaster_shiny_colors, knee_up, large_breasts, long_hair, mouth_hold, panties, sitting, solo, sonoda_chiyoko, sora_(men0105), sports_bra, stomach, tying_hair, underwear, underwear_only