If you're looking for anime similar to Grand Blue, you might like these titles.
Rinko Sakuma thought she was working for a regular detective agency, but two months into her new job she learns that her employer, Akutabe, is actually a demon summoner who calls creatures from the depths of hell to carry out revenge for his clients. Rinko’s first experience of a demon comes in the form of Azazel, a devil whose power is to incite lust in return for an offering of food. Unfortunately, as if being harassed by the flirtatious demon isn’t enough, Rinko has been forced to into signing a contract with him for eternity! Now the innocent office worker must work with Azazel, the fecal gourmet Beelzebub and a whole host of equally deranged devils to complete jobs for the agency; though with the demons' habit of bungling tasks and making the situation worse, it won’t be easy...
Chiyo Sakura, a high school girl who fell in love with the unrefined boy schoolmate Umetaro Nozaki, decides to be courageous one day and asks him out. Her feelings weren't conveyed properly, and before she knew it she ends up helping a particular job of his as an assistant... The series is a shojo manga boy comedy which centers around Nozaki, a high school boy that is a popular shojo manga artist, and has a story woven by very individualistic characters.
Nitta Yoshifumi, a young, intellectual yakuza, lived surrounded by his beloved pots in his turf in Ashikawa. But one day, a girl, Hina, arrives in a strange object, and uses her telekinetic powers to force Nitta to allow her to live with him, putting an end to his leisurely lifestyle. Hina tends to lose control of herself, wreaking havoc both at school and in Nitta's organization. Though troubled, he finds himself taking care of her. What will become of this strange arrangement? It's the beginning of the dangerous and lively story of a nice-guy outlaw and psychokinetic girl!
All Asakura wants is to graduate and become a high school teacher, but not for the reasons you’d expect: he wants to be surrounded by boobs - ample, bountiful boobs. But Asakura’s goal of mammary immersion won’t come easy, as his best friend Ishida is determined to open a flower shop with him once they graduate - that is, if they manage to graduate. Together, the duo navigates day-to-day school life with crass, whether they’re ogling their busty teacher, taking on part time jobs or dodging assassination attempts by robots.
The story follows a third-year high school girl who likes building plastic models and the wacky conversations she has with her fellow club members.
Pipimi and Popuko are two typical 14-year-old girls with endless energy. Together, the two become the stuff of memes by having shootouts in space, traversing video game worlds, stealing an umbrella from [redacted], or other spastic misadventures.
Despite his best attempts, Ric’s unorthodox days under the bridge continue as always. He’s making little progress with his clueless lover, Nino; Hoshi continues to torment him at every turn; and even a simple baseball game leads the hapless heir to make an enemy out of a large Amazonian warrior woman! With bungled attempts to move in with Nino leading to the pair trading rooms and the highly competitive Arakawa Marathon taking place, Ric’s idyllic riverside life seems destined to prove more problematic than ever.
When high school student Haruka Shinozaki confesses his feelings to the beautiful and aloof class representative, Akiho Kosaka, the last thing he expected was for her to say "yes." Like everything else in her diligent life, Kosaka takes dating quite seriously. In an effort to be a good girlfriend, Kosaka decides to meticulously study (and bluntly suggest) all manner of ways to keep Shinozaki sexually satisfied… in the theoretical sense, that is. This innocently lewd relationship is only just beginning!