alpha_(yukai_na_nakamatachi) arms_up beach beach_volleyball bikini blonde_hair blue_eyes blue_hair braid breasts cleavage day dutch_angle front-tie_top game_cg hair_ribbon large_breasts midriff multiple_girls outdoors polka_dot polka_dot_bikini polka_dot_swimsuit red_eyes ribbon sarah_adiemus school_rumble school_x_school short_hair side-tie_bikini swimsuit tsukamoto_yakumo volleyball water