S1.E4 ∙ The Secret of Gotham Base

The anime centers around a boy named Kouta Kouka "Kouka Kouta in Japanese name order, an apparent wordplay on Coca-Cola". Kouta strives to be the world's best Bottle King at the Bottle Battles in the virtual Drink World. He comes across his Bottleman partner Colamaru and then wages battles with various rivals.

The band-aid on Katta Kirifuda's forehead -- used to suppress his uncontrollable power -- has peeled off. There seems no adverse effect at first. Suddenly, Katta's pet hamster Hamkatsu starts talking, revealing a big secret.

Yorito Morimiya meets Matsuri Shihou, an immortal ageless "Yaka". Their chance meeting unravels a story that stood still for hundreds of years.

The Weiss Kreuz OVAs technically come after the TV series. Kaori and Akira, sister and brother whose parents were murdered by the American military then said to have died in an accident, are trying to do themselves what Weiss is meant to do. Kaori, a teenage girl who attends the same school as Omi, hacks into the American database while her brother, Akira, goes in to kill the man responsible. Since he is trying to do this Weiss gets a mission to destroy him. Omi, being friends with Kaori, and Ken, thinking that Akira and Kaori are in the right, both refuse the mission. Aya and Yoji, however, accept. This leads to conflict within Weiss.

When alien invaders come to Earth, the Jin family reveals its alien nature. Their ancestors came to Earth from planet Biar, after it was conquered by the army of Gaizok, who is now aiming at conquering Earth. With the help of ancient documents they will find the ships of their ancestors and assemble the robot "Zambot 3", to fight their old enemy.