A woman wears a low shirt that exposes some cleavage.
A girl is shown in a bath, but the water obscures any detail.
There is reference to the myth of Oedipus.
During the opening theme song, a young woman (possibly high school age) is seen trimming her hair and it is implied she is nude from the waist up. Although no cleavage/breasts are visible, the camera noticeably pans over the skin above her chest before the character comes eye to eye with the viewer. She then makes a flirtatious expression at the camera.
Very little worth mentioning. A girl is briefly scene in a bath, no nudity is shown since water covers her body, nor is this intended to be done in a "fan servicey" way. The only mildly questionable thing in this category, is the appearance of the Sphinx painting. The painting displays non-sexual nudity, it is shown on very rare occasions and it is only for a few seconds each time. Keep in mind, the painting is the type of thing you would see in a museum and in no way comes off as being arousing.