All of the cop stuff is fairly self-explanatory, so far as Togusa knows it, Yamaguchi was just his partner on a standard kidnapping case, he recently remembered that the known culprit was some guy named The Laughing Man.

Tachikomas! Tachikomas are tanks with legs like spiders. That talk philosophy. And dance. And....have grenade launchers. They're complicated. But adorable. And Togusa worked with them.

Do you have any questions on any of the specific memories?