Genre - Mecha

From PRISMS: Wahhaman is a special robot soldier built ten thousand years ago by the Atlanteans. Found and dug up in present-day Toukyou, he doesn't remember anything, due to a nasty knock to the head he received at some point.

An expansion of the Strike Witches series, World Witches - Contrail of Witches details the short stories of various witches from areas of the European front of the Neuroi War.

From DrCoke at MangaHelpers: Six years ago, Tsukihiko was caught in an assassination attempt on a little girl, Sami, when he attempted to be her shield. This incident nearly killed him and the girl together, but the little girl was the daughter of an extremely powerful family. With its vast amount of resources, the family was able to keep both Tsukihiko and Sami alive by recreating both of their bodies with cyborg technology. This has forced Sami to permanently rely on wired connection to her life sustaining computer. On the other hand, Tsukihiko has become a cyborg "Knight," sworn to protect Sami from harms way.

The Isekai hero has defeated the Demon King and is being returned to his world; however, when the princess gives him a hug, they are both transported to a futuristic world.Can they survive right now?