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.

Ifrit, who has been trapped in Rimuru due to the latter's Predator skill, recaps events of the season while in a discussion with Veldora as they play Shogi.

A summary of season one of Tensei shitara Slime Datta Ken with some extra content leading into season two.

Twelve-year-old Linn Youki loyally supported his father when the world laughed at the scientist for saying that Earth was about to be invaded from outer space. But Linn did not expect to become personally involved--until he met Takoro, the strange young "deputy sheriff" from another world who was on the trail of notorious space criminals. There were only four Kurodako Brothers, but they plotted to use their alien science and natural shape-changing powers to become the secret masters of Earth. With Takoro's help, Linn became the mighty super-hero, Muteking, to foil their schemes. There is plenty of action and laughs in this light-hearted comedy-drama about a roller-skating costumed hero, his friendly but bumbling alien partner, a gang of klutzy would-be world conquerors, a beautiful police chief, an obsessed scientist, a sarcastic dog, an officious flying saucer, and others. This unusual but appealing cast of characters will charm viewers' hearts while it amuses them.