Hobbies are often a great way of meeting new people, but how could Kakeru Diachi, who collects rare juice cans, have ever suspected that he'd meet a fascinating new girl when he attempted to DRINK her? Naming her Melon, because she's got great melon... soda, Kakeru quickly learns that she's an Akikan—a beautiful girl who's also a special can created to fight other Akikans in a strange experiment to determine what kind of container is better: steel or aluminum! Will becoming involved in this ridiculously twisted research project gone amuck complicate Kakeru's life incredibly? Of course it will, but because Melon's steel body needs carbon dioxide to breathe, he's now stuck with her since she's too CO2 dependent! And when his wealthy, attractive, best childhood friend Najimi gets HER own aluminum Akikan, the trouble really begins!

The franchise is celebrating its 20th anniversary with this new project. In this story, the world is in chaos, thanks to Washu. Now in order to save it, Tenchi Masaki must go undercover as a student teacher at an all-girls school. Unfortunately for him, trouble always comes his way as he has a hard time dealing with the hijinks of his new students.

Private Tenshou Gakuen is the seventh of ten school districts circled within a 130-meter tall wall with restricted entry and egress aside from officials. The academy is fully autonomous by the government but to strive for independence, the school allows students to engage in club activities after school, which comes with a strangely unique system. Each club is ranked according to its overall accumulated points gathered from various club activities and school events. Points can also be received by winning at the school's periodic Tenshou Gakuen Singing Contest, where many students compete. The members in the clubs work hard to win the contest for their goal.

Based on a game by Princess Soft The main character, Junna has a twin sister Senna. He is an ordinal student of an elite school. However, in the past, a traffic accident deprived him of his parents and his memory. Junna survived the accident, and he has lived only with his sister though he has been looked after by his relatives. And present... The life with Senna in the same high school is so pleasant that he can forget the severe past. Because he has been in the world where there is only Senna, his lives in this town, such as the beginning of a new life, new environments, and the meetings, are so refreshing. However, he begins to recall the memories he lost in the accident. Though he enjoys happy and pleasant days, he is tossed by the past, the present, and the future. What is the truth hidden in his memory? (Source: AniDB)