As the Earth Defense Club plan to see the Student Council off as they go to study abroad, an hourglass monster appears and destroys their Loveracelets. When the monster appears the next day, Wombat returns and gives the boys new Loveracelets, allowing them to transform into the Battle Lovers once more and defeat the monster with just enough time to see the student council off. Meanwhile, a sinister pair of twins decide to transfer into Binan High School.

Two twins, Haruhiko and Akihiko Beppu, transfers into Binan High School, attracting the attention of overweight, beauty-obssessed student Tsukurou Osou. After charming most of the school, the twins, also known as Galaxy Vepper, transform Osou into a Tofu Monster, which is soon defeated by the Battle Lovers.

With the Student Council studying abroad, the Defense Club is asked to present a reading to children. Tagaru Katari, a member of the Speaking Poets Society, is upset at this development as he thinks that only someone with passion can do this job. Thanks to a suggestion from Yumoto, the group decides to do the story "Jizo and the Hats" for the children. But when Vepper transforms Katari into the Mic Monster, it's up to the Battle Lovers to keep the children safe and save the play.

Continuously annoyed by Yumoto's brotherly connection to Gora, Haruhiko and Akihiko try to come up with a new plan to destroy the Battle Lovers. Meanwhile, Bernardo, the older of the Italian twins that also recently transferred to Binan, tries to figure out if his brother really hates him as the two have had a rocky relationship recently. Taking advantage of this development, the Beppu twins transform Bernard's brother Alan into the Chest Hair Monster. Thanks to the Battle Lovers, the monster is defeat and Alan and Bernard finally work out their differences.

Fed up with Munakata's practicing in the Volleyball club, Shuzo Oka quits. But as Munakata finds a new club ally in Yumoto, Shuzo becomes jealous and is transformed into the Volleyball Monster. When he finally sees the truth, Shuzo and Munakata vow to not graduate until they finally participate in a Volleyball tournament. Meanwhile, we see a little more of a connection between the Beppu twins and a certain former Battle Lover.

To the rest of the Defense Club's disappointment, Io and Ryuu got themselves into a little fight. Yumoto, En, and Atsushi excuse themselves to Kurotama while Wombat is left to help Io and Ryuu reconcile, though with no results. The flashbacks show how Io and Ryuu met, showing us they couldn't stand each other at first, and how they decided to join the Defense Club. Kuroshiro Kumano approaches the Beppu twins on how to become an idol, as he would like to become like them.

Christmas is a magical time that makes people go a little crazy. On the day of Christmas Eve, Yufuin makes the shockingly uncharacteristic suggestion that that they hold a Christmas party. Gora joins the Christmas party at Kurotama Bath, and even more unexpected visitors show up, throwing the party into chaos! A one-night-only miracle of love and confusion begins!

It's New Year's Eve, and the Defense Club members are gathered at the Kurotama Bath, fighting over the TV and cozying up at the kotatsu with their usual leisurely air. Although they expected to go their separate ways after eating Gora's home-made soba, the area directly around the Kurotama Bath is suddenly hit by a blizzard, which cuts them off from the outside world! How will the club react to this disaster situation?!

The Beppu Brothers declare outright to the Defense Club that they're the ones who have been sending the monsters, but the Defense Club members just brush them off, spending their days in their usual slow pace while ignoring the brothers for two whole months. The Beppu Brothers, enraged over this slight, choose February 14th as the day they will have their revenge. And so the Valentine's Day grudge match begins!

The always-energetic Yumoto is sighing, which takes the other Defense Club members aback! It seems an old amusement park he used to go to, Binan Land, is closing. The other Defense Club members aren't too surprised, saying "it was a pretty sad place" and "Every couple that's gone there has broken up," but Yumoto is truly despondent at the thought of losing a place he used to go to with his big brother. The others can't stand to watch him looking so down, so they pool their money to give Yumoto one last trip to Binan Land.

The wood chopping-obsessed Gora has gone missing, leaving wood unchopped! Yumoto and his "senpais" search fervently for Gora, but can't find a single clue as to his whereabouts. A dejected Defense Club returns to the bath to relax, where they receive an unexpected visitor...

The Defense Club has decided to fight to save Gora, and VEPPer will try to keep him at any cost. How will this heated battle end? Will love save the Earth?!