Hentai?Nah.

A split screen shows a character with closed eyes and a flushed face on the right, while the left side displays a close-up of a bare chest with a small red mark; the character on the right opens their mouth in surprise as the scene transitions to a wide shot of a large squid-like creature leaping from the water, with a bright sunburst behind it and two characters on a pier watching from the right.