Humanity is plagued with attacks by a race of sea mutants dedicated to eradicating mankind. Our last hope is the Blue Submarine No. 6 and her crew, made up of the best personnel available as they fight for the fate of all mankind.

The poles are shifting and most of the Earth's land is now underwater! The scientist Zorndyke has created a race of beast people to challenge the humans for global supremacy. But who is the real enemy - Zorndyke or humanity itself?

Tetsu drifts in the open sea. As his life flashes before him, he begins to black out. But when he comes to, he finds himself resting on the hull of a half-sunken ship. His savior is one of the enemies.

After surviving another undersea battle with Zorndyke's forces, the crew of Blue Submarine No. 6 returns to base for repairs. While on base, Tetsu continues to display his trademark lack of concern for authority and continues to annoy Mayumi.

Humanity is plagued with attacks by a race of sea mutants dedicated to eradicating mankind. Our last hope is the Blue Submarine No. 6 and her crew, made up of the best personnel available as they fight for the fate of all mankind.

When the girls tackle the drama club, dramatic chaos appropriately erupts, from Hiina tackling the "u" word to Yua bringing up two "dangerous" ideas! Later, Koharun becomes more embarrassed than ever as the club puts on a play based on... the club's skewering of the drama club!

You can't have a school anime without a school festival, and Koharun is enjoying her first, but it seems something fishy is going on with all the maid cafes there. Afterwards, the theme is a "new tennis club" and somehow Yua brings worn-out panties into it...

When Koharun forgets her lunch at home, she plans on buying at the school store, but finds that it's just as mobbed as depicted in anime and manga. At the club, the theme is a "new newspaper club", and the girls come up with an entire retro-style manga/anime series. Finally, Mobuko joins the members in the gym for an activity that embarrasses Koharun to no end!

This time, the Tesaguri Club tackles the high school brass band. Aoi doesn't care for the idea of a coed club, but it gives Koharu the chance to introduce a romantic element to the proceedings. Later, Mobuko-chan and her sisters join in as Yua conducts the Tesagure brass band!

After the school changes to summer uniforms, Koharun notices a certain characteristic of Hiina's chest. This leads to the revelation of an astonishing hidden "secret" of the uniforms. After school, they meet at the club to riff on and then come up with new ideas regarding the cycling club.

What is the connection between student council and the Tesaguri Club? Why is Koharu nervous about how other students view the club? And after another meeting of coming up with twists on existing clubs, what causes Yua to crack?

Koharun thinks she can tell a student's "character type" with no more than a glance until Hiina and the others teach her who the real "characters" at their school are. Later at the club, they deconstruct and reconstruct shogi, followed by a giant-size shogi game with a "twist" in the school gym.

The more Koharu learns about her mysterious club, the more unsettled she is. For one thing, her fellow members seem to think she may be the "main character". For another, Yua has the ability to read Koharu's thoughts... or at least hear her voice-over narration. And then there are the strange club activities, like a mash-up of soccer with composing haiku...

It's March and even though they thought their peaceful days would never end, graduation season has come to the Tesaguri Club, too. Aoi and Koharu celebrate Yua and Hina's graduation. As they clean up the clubroom together, memorable items pop up. And as Koharu picks up a certain file, their conversation turns to one year ago...

Yua and Aoi tease Koharun by saying embarrassing things about her to a boy, but he seems to exhibit a personality characteristic common among anime high school boys... Later, Mobuko and her sisters join in the fun when the Tesaguri Club deconstructs both an astronomy club and a cheerleading team.

While bringing garbage out back behind the gym for the first time, Koharun learns an "unwritten rule", something that must always be done there. Later, Yua and Hiina indulge Aoi when she deems it unfair that "eyes" are so much cooler than the "mouth" when it comes to idioms.

First-year high school student Koharu gets drawn into a strange club that deconstructs typical clubs, imagines how said clubs could be improved through unique changes, and then actually tries a wild mash-up of two disparate club activities. But how will "straight man" Koharu fare in a club with three oddballs?

The mix-and-matched members talk about movie theaters, but when Kanon oddly boasts that she's never been to one, they all decide to go together, a dangerous prospect considering this group. But afterwards they discuss how movie theaters could be improved, such as having wet seats. Later, the original Tesaguri members are live at the zoo, where they're lucky enough to watch and be watched by procreating animals!

Amuro witnesses a woman pushed from the top of the stairs at Haido Park. However, he doesn't see the culprit's face. The unconscious and gravely injured woman pushed from the stairs is Jodie's friend and Haido Elementary School teacher Natsuko. Conan and Jodie head to the park and determine Natsuko was attacked somewhere else, and it soon becomes clear she was assaulted at the school. Later, Megure and the police question her coworker Sugamoto, who tried to give Natsuko a ride home, and Ueno and Kandachi, parents of students with appointments to see Natsuko...

The band suspects Taki played favorites in choosing Reina in the auditions. Noticing the band's rising distrust of Taki and Reina, he makes a proposal.