Some arguments of the characters have an sexual background, and there are some sexual poses, between the protagonists, too.
In a scene, the male protagonist accidentally takes the top of a swimsuit off of a female character. No nudity is shown.
In another scene, a female character realizes that the top of her swimsuit is missing, and puts her chest against a male character's back so that no one else sees.
In uncut version, breast are shown.
In the first episode, a female character is shown in a seductive position, pulling both her pants and her shirt up to reveal her panties and her under-boobs. The female character in question looks like a young teen. I don't know how old she canonically is. This is a 3-5 second pose from someone's imagination.
In a scene, a character is fondling other characters' breasts.
