We're enemies. Sanae was shocked by his words and leaves the lodge by herself, and then is captured by ghost hunters. Everyone tries to go find Sanae, searching high and low. A female spirit tries to sway Sanae's heart, but to what end? Koutarou has something up his sleeves, though.

The fight over room 106 is officially on a cease-fire as they've all received a voucher to travel to a ocean-side resort for relaxation and hot springs. Everyone is excited and they all decide to go buy some swimsuits, but something seems to be going on with Sanae.

The lot continue to fight over the room, and eventually decide to use the inter-club obstacle course marathon as their next battleground. Koutarou and Harumi enter as part of the Knitting Society, along with Sanae. Theia and Kiriha get their underlings and make their preparations.

Corona House's landlady, Shizuka, imposes the Corona Convention on the lot, which causes the invaders to rethink their strategies. Meanwhile, Koutarou participates in the Knitting Society, where its president, Sakuraba Harumi and Koutarou spend their time, away from troubles, but then there's word that four new students will be transferring into his school...

It's December, and they've finally all gotten used to living each other in Apt 106 at Corona House. Koutarou suddenly starts a secret part-time job, even though he's about to start practicing for the second half of the Blue Knight play. The girls all wonder if he got a girlfriend, and start getting jealous. Just what will happen?!

Kiriha invites Koutarou to an amusement park that she had been to before. Sanae and the other trails the couple as they spot a rhinoceros beetle hero show. Ruth disappears and wacky highjinks ensue. Kirito and Koutarou get on a Ferris wheel, where Koutarou hears the true purpose of her invasion and the story of her first love, but then earth starts to rumble...

After a request from Kiriha, the gang helps out with a local kindergarten hero show. The Sun Squad shows up all of a sudden joining them in the mix. The show ends without incident, but Kiriha disappears and helps with cleaning up the town. Koutarou watches the girls who want to take over the town, but finally tells Kiriha something that's been on his mind. Isn't Kiriha too kind to try to take over the surface?

Satomi Koutarou just started high school and now he's living by himself because his father was forced to transfer to another city for work, and that's when he found an apartment at Corona House, Apt #106. Its rent: 5,000 yen a month due to certain special circumstances.

While dreaming of Ritz's past, we find out how far her penguin family is willing to go for her. They must put the Super Antarctic to good use!

As Ritz and the others walk back to Penguin Castle, the Emperor continues testing the penguin particle device. Kiriko and Ritz face off, woman to woman!

Kiriko and Shouma must work together to take down Antarctic Number 11, but Shouma refuses to touch Kiriko anymore. He must find another way!

With Kouichi out of the picture, a new main character arrives. The Penguin Empire has almost grasped complete victory. Now, Kiriko must fall in love.

A new robot, the Ritz Custom, appears after the Emperor discovers the secrets of Daimidaler. Will Kouichi be able to survive such a powerful foe?

The Penguin Empire finally succeed infusing a penguin with Hi-ERO particles and Kyoko meets a mysterious and handsome stranger with no memories.

A mysterious girl who loves penguins suddenly appears within the Penguin Empire. At the same time, Kouichi must become worthy to pilot Daimidaler.

Unable to reproduce the original burst of Hi-ERO particles, Kouichi must discover the true power of Eros to defeat his new enemy, Antarctic Number 9!

The final battle has begun. Now Beauty Salon Prince must partner with the Penguin Empire to defeat a whole new enemy?! Stand up and fight, Daimidaler!

Madanbashi Kouichi is back, and he's stronger than ever. Together, he and Kyoko are back in action, but what's the deal with Daimidaler's new upgrade?

As Kyoko's eyes begin to open, Kiriko's most valuable possession is taken away. Kiriko unleashes an attack against Ritz and the city behind her.

One day, pervy high school student Madanbashi Kouichi finds himself pursued by a mysterious beauty and a gang of strange penguins. On top of that, a giant robot starts rampaging through town! Could Kouichi's Hi-ERO particles be the key to saving the city?