Erisa Langley just graduated and her reward is a cruise ship full of pussy. Not subtle about it either. The game opens with her basically vibrating at the thought of finally having time to get her face wet after years of textbooks and deadlines. Top students get a free trip and guess who qualified. The whole setup is just an excuse to trap a bunch of college girls on a boat with a protagonist who describes herself as "crazy about the taste of pussy" and honestly, respect the honesty.
The art is that specific kind of CG hentai where everyone looks slightly glossy, like they've been polished with furniture wax. Not complaining. The scenes move fast, sometimes too fast. One minute you're on deck chatting, next minute Erisa's tongue is somewhere that would get you banned from a public pool. The writing has this charmingly direct quality, like someone translated their horny thoughts through three languages and didn't bother cleaning it up. "Smelly pussy" gets mentioned. Multiple times. It's a whole thing. The game knows what it is and doesn't pretend otherwise.
Summer vibes are there I guess, but mostly as wallpaper between the lesbian action. The cruise setting feels like a suggestion rather than a real place. You won't learn anything about nautical life. What you will get is Erisa finding increasingly creative locations to bury her face while her fellow graduates discover their own sapphic tendencies. The student characters blur together after a while, same face syndrome hitting hard, but does that matter when the whole point is watching them discover what Erisa's tongue can do? The game's about as deep as a puddle but sometimes you don't need depth, you just need a girl who really, really loves eating pussy on a boat.