It is the 23rd Millenium. Humanity is at the zenith of its scientific achievements, but even so, the galaxy beyond the Federation's borders is a hostile place. An Iron Man who has worked alone for centuries battling humanity's foes finds out that he will be receiving a Stone Man AI as a partner. The placement is odd, but at least he won't be alone anymore.

Taki Tachibana and Mitsuha Miyamizu's lives could hardly be more different: one, the sole heir of a powerful hive world manufacturing conglomerate, the other a preacher attached to a militia. After swapping bodies, they leave their marks on each others' lives, and discover things about themselves as well. Full fusion into 40k, knowledge of KnNw not needed. Completed.

Lina Inverse just can't catch a break! A few months after the defeat and banishment of Dark Star, just when Lina thought she was in luck, a mishap at the Temple of Chronos leaves the Slayers stranded in another world. The group is joined by Luke and Milina as they pursue their goals and dreams on the Grand Line. Act 1 completed.