A character wears short shorts throughout the show that are very close to being just underwear.
The end credit scene in season 1 has Chaika nude, she looks like she is sleeping or unconscious. It's her silhouette and she's on her side, so you can see the shape of her butt from a side view, and she has her arms in front of her chest so her breasts are not visible. It's easy to miss but it is in every episode at the beginning of s1.
