In the mood for some good old-fashioned gambling fun? Head on over to Howard Resort, a famous entertainment destination that's home to the voluptuous, and said to be lucky, dealer Rio. Alongside other casino dealers and staff such as the clumsy Anya and bunnygirl Elle and Ille, Rio helps tend to the whims of the resort's customers. With Mr. Howard constantly forcing her to wear more and more skimpy outfits and even a ghost tinkering with the hotel's plans, it won't be easy! Especially since Rio is the holder of a very special card known as a Gate – a card that other dealers of the world want desperately to acquire, as only then will they earn the title of Most Valuable Card Dealer...
When Mifune fell hands first into Chiharu's bulbous, bulging bosoms one day, he had no idea his life would change forever. For the girl is a member of Eiken, a school club filled with busty beauties such as banana-loving Kirika and the exceptionally top-heavy child Komoe, and they've decided to recruit the boy as one of their own! With perverted situations at every turn, Mifune finds himself in frequent compromising positions, whether the group is participating in swimsuit bungee jumping, riding a yogurt slide in pairs or even seductively eating phallic food.
Boobs. Bouncing on your screen, with cleavage showing outfits that show enough without a slip of the nip. They're fanservice riddled without trespassing into the nudie territory and where they lack in a decent story or sensible writing, they make up for it in absurdity; be it Rio: Rainbow Gate's Gate battles or Eiken's... competition. It's really all about the women and fanservice so leave your brain at home, it's not needed here. Both are crap but for some they're guilty pleasures.
On scholarship, Hino Akiharu has transferred to Hakureiryou Academy to become a member of the Servent Education program, destined for life as a butler in the houses of the fabulously wealthy. But on his first day, a chance accident causes him to land hands-first on the chest of the school's most voluptuous and prestigious student, Selenia Iori Flameheart. Now, struggling under the punishing Servent-Ed curriculum, tormented by his childhood friend Tomomi and annoyed to no end by the pompous Selenia, Hino has to find a way to make his grades, make some friends, and make it through at least one day without stumbling upon an unfortunate, naked coed!
Quite simply, you aren't watching either of these for story, characters or any of that crap. You're watching these for the three B's: Boobs, booty and bouncing. You get that and fanservice, with a dash of sleaze, a whole lot of shine and a whole slew of perversion. And more fan-service. Both hardly have any redeeming value but are questionable fun if you're in the mood for some ecchi without any of that pesky thinking.
Sayuri Satou works as a front desk clerk at a typical downtown hotel, but she's no ordinary employee! In addition to her friendly smile and massive chest, Sayuri is also strangely skilled at hand-to-hand combat, making her an excellent bodyguard against the ruffians who loiter outside the establishment. Alongside fellow co-workers Misono and Tamaki, Sayuri helps run day-to-day activities at the Sparrow's Hotel such as renting out rooms for Golden Week and performing for surprise inspections!
While these two don't perfectly fit together, I agree with the existing recommendation that Rio and Sparrow's Hotel are a decent rec pair. They both are about a super gung-ho person in charge of a hotel/casino, are fairly slice of life with comedy elements, and have random ecchi moments (it's up to you if that's a good or bad thing).