Newly enrolled Sun makes quite a splash among her classmates on the first day of school, but Nagasumi is more concerned with some of the new teachers - Sun's dad and his goons!
The Seto clan is locked in battle with Yoshio's forces! If Nagasumi and Sun are to live happily ever after, he'll have to be braver than he's ever been!
Sun and Nagasumi leave Maki behind and venture out to take in the sights and sounds of the city. When Nagasumi has to confront a couple of bullies, they may wish the tiny terror was still around!
Mawari thinks there's something fishy about Sun, so she begins an investigation. When the clues lead to a dangerous situation, Sun might have to reveal her secret to keep her new friends safe!
When Nagasumi discovers the secret mermaid identity of a famous pop star named Luna, the little diva demands he become her personal slave! Her plans for childhood rival Sun are even more drastic.
Luna requests some one-on-one tutoring from Nagasumi, but no amount of studying can prepare him for the consequences when he's caught in a compromising position with his pop idol pupil!
Luna and Nagasumi's wedding is interrupted by the dramatic entrance of an uninvited guest - and instead of bringing a gift to the ceremony, this party crasher is brandishing a blade!
During a class outing to Kyoto, Akeno tries teaching Sun how to control the bodily changes that happen when she gets wet. As they close the bathroom door behind them, Mawari totally gets the wrong idea!
Nobody believes Nagasumi when he claims he's being stalked by a relentless force of destruction, a huge man with a shotgun who won't stop until his prey is cornered - and terminated!