1boy 1girl ahoge back-to-back black_eyes black_hair black_jacket blue_eyes braid closed_mouth commentary_request darker_than_black gas_mask gloves grey_background hei_(darker_than_black) holding holding_mask hood hood_down hoodie jacket jimon_asuta kani_biimu long_sleeves mask red_gloves sekai_seifuku:_bouryaku_no_zvezda short_hair side_braid simple_background unworn_mask