A stray missile from a confrontation between the Galman empire and the Bolar Federation crashes into the sun, turning it into a time bomb of radiation. The Star Force once again sets off into space, this time on a quest to look for a new world for the human race. (Source: ANN)

Lupin has a lively time of it this time in a classic car race from Madrid to Paris. The race prize is Napoleon's dictionary, which contains the key to the Treasure of the Empire, something that just about everybody seems to be after. Lupin and his buddies take off after the prize, pursued not only by the perennial Inspector, but also by an army of secret agents from around the world. Classic cars and state-of-the-art weapons heighten the speed and thrills of this adventure.

(Source: AniDB)

The science lessons are short "omake" bonus features originally present on the first two volumes. Each short lasts around two minutes, and stars super deformed versions of Noriko, Kazumi and the Coach explaining the various scientific aspects of the series. (Source: Wikipedia)

Lina and Gourry travel to a seaside town named Acassi, where octopus tentacle is a delicacy. However, the octopus meat carries a curse that dooms the eater to only speak Takogo (octopus language). Amelia, Zelgadiss, and Xelloss all show up, and the main four characters (Lina, Gourry, Ameria, Zelgadiss) get cursed. The octopi enlist the power of a mazoku to get rid of the humans once and for all. The white sorceress Ruma must learn the cure to the curse from her long-lost master in order to save the town. 

(Source: ANN)