Nagasumi, a teenage boy, is saved by the chivalrous mermaid Sun while drowning in the ocean off the coast of Seto Island. Mermaid society rules are...

Nagasumi enjoys his first date with Sun at the Bon Festival. However, most stalls are operated by the Seto-Gumi. Later, Nagasumi soon finds out that...

Sun and Nagasumi get to spend a whole day alone on a deserted island. However, this is a trap meant to eliminate Nagasumi, as the group's notorious...

As a dutiful wife, Sun follows Nagasumi back to his house in the city, where she is to live with him and his parents. However, the first day back...

Sun and Nagasumi attend their first day of school. Sun's father and the gang have all become teachers at their junior-high school, and Nagasumi's...

Mawari notices Sun's fishtail and comes to the conclusion that Sun is a fish. She keeps trying to splash Sun with water in order to verify her...

Nagasumi runs into Lunar, a popstar idol; her mermaid form is accidentally revealed to him. In turn, Lunar plans on making Nagasumi her slave...

The situation at school keeps escalating, and even Maki is hurt in the process. In order to avoid total war, Nagasumi comes up with a plan to settle...

Nagasumi's life only gets more hectic with the arrival of Kai Mikawa, a handsome, rich, but agoraphobic merman, who insists that Sun is his...

A strange, huge, practically invincible man, stalks Nagasumi and nothing can get in his way. Nagasumi tries to tell his friends, but initially no one...

After Sun and Lunar go on a diet, Sun's father buys her all sorts of presents to help her out, including some special "mer-water" that energizes and...

Nagasumi's mom and Sun go shopping for groceries, leaving Lunar alone with Nagasumi. Lunar plans to make her "slave" help her study for school since...

Nagasumi is taken back to Lunar's house where a wedding ceremony is going to soon begin. Moments before Nagasumi is meant to become her husband,...

Nagasumi finds a kitten and brings it to school. Nagasumi soon discovers that Sun, Lunar, and Maki are all deathly afraid of cats, and gets the idea...

Nagasumi, Sun, Lunar, Mawari, Saru, and Mikawa go on what is supposed to be a double date. As Nagasumi goes to get a juice ordered by Lunar, he...

Akeno Shiranui, a mermaid examiner has come to record and observe mermaids that doesn't fit well with humans and send them back to their origin. Now...

Defeated by Akeno, a group of delinquent lords follow her around which mislead Mawari into believing Akeno was also a delinquent. In order to protect...

The whole class went for a sudden trip to Kyoto. After an incident where Maki attacked Akeno, Sun apologizes to her, but Akeno issues that she's...

After the attempt to rid of Nagasumi from Sun fails. Akeno is now undertaking a mission, to foil Nagasumi by forcing him to gulp down a mermaid drink...

Lunar's father searches for ways to express his love and cheer up his precious daughter when he accidentally spots a Galge from a search engine....

Nagasumi receives a love letter from the class president. Being the first love letter he has received in is life, he completely loses his mind. Maki...

Lunar tries hard to practice her part in a drama. She gets Sun to help her be her lover as a man. Unfortunately, Sun goes overboard and eventually...

Believing Masa was an acquintance of her older brother, Akeno asks Masa about her brother's whereabouts, but Masa had lost his memories before...

Kai has an embarrassing problem about himself that he wants to keep a secret from others. It ends up that he just has a boil on his butt, however,...

It is first time that Sun and Nagasumi has a quarrel, and both end up not talking to each other. At the same time, the members of Seto Group are...

Nagasumi, Kai, and Lunar go to save Sun. Once they get there, the Seto Group manages to break free and a huge battle commences. Nagasumi manages to...