If we just check at the parts where the soles of the feet are visible, we can see that they are midori's right_foot(1), momoi's feet(2,3), aris's right foot(4), and yuzu's feet(5,6). The foot covering yuzu's ass is aris's left foot.
except none of them have two left feet. or two right feet.
It looks confusing because Momoi and Aris' legs seem to cross into each other, and if the left foot at that cross section is Momoi's, then I should consider calling the paramedics for what seems to be a very concerning dislocation of her left ankle.