Kenji Tomosaka moved to this coastal town when he was a child. At that time, the sea spread in front of him was shining like lamune, reflecting the sunlight of the summer. There, he met a girl. Her name is Nanami Konoe, who lived next door. Her room is only 1 to 2 meters away beyond the veranda. Their rooms were so close as if they were within their arms’ reach. As the time passed, the seasons came round, their memories have been accumulated with time. They think of their normal lives and common relationship as precious things. The sun begins to shine strongly, cicadas begin to buzz, and the sky clears up… Here comes the summer, again! For Kenji and Nanami, it is normal summer, but it has special meaning…

Lamune has returned to Earth with no memory of his adventures on Hara-Hara world and Doki-Doki space. The remains of Gobuhriki find their way to Earth, and awaken the spirit of Don Harumage. While Cocoa builds a fighting vehicle with stuff she finds around Tokyo, Milk and Leska set off to find Lamune and Da Cider to save the day before the new Gobuhriki is revived and destroys the Earth.

Baba Lamunade is followed home by two strange peddler girls who give him a CD-rom game. After he beats "The Legend of Lamuness", the girls come out of his computer and bring him to DokiDoki Space. He is the third descendant of the hero Lamuness who must stop Don Genosai from resurrecting the great evil Abraham. Accompanied by PQ, his advisor robot, and Parfait and Cacao, he must pilot the Kaizer Fire mecha. However, he needs another pilot, and Da Cider is chosen as the second pilot.

To save the galaxy from impending doom, Cacao and Parfait are sent on a mission through time and space to retrieve the Fourth Warrior, Lamunes. Unfortunately, Cacao and Parfait discover Lamunes at the helm of the marauding Giga Genos invasion fleet. World by world, Lamunes is determined to bring the entire galaxy under his tyrannical heel. With the help of a plucky orphan, it’s up to Cacao and Parfait to stop Lamunes from taking over the world. Action,comedy,and endless fan service!

Baba Lamune, a 4th grader, is pulled into another world after he beats a video game he bought from a street peddler. He arrives in Hara-Hara to discover he's destined to save the world from the evil Don Harumage, with the help of the Guardian Knights, free-thinking robots. The writing is heavy with word-play; even the characters are named after popular Japanese drinks. It has 4 sequels, including 3 OVA, named "[NG or VS] Knight Lamune & 40"

Lamune and Da Cider head off to Puff-Puff Palace to rescue two beautiful barely clothed maidens, Gold Mountain and Silver Mountain- the Mountain Duo. This of course infuriates Milk and Leska, who with a rather confused and unwilling Cocoa "transform" into "Seinaru Milky", "Seinaru Cacao", and "Seinaru Lemon". The three then head after their would-be boyfriends to extract their revenge.