I Opened a Café in Another World. - Volume 2, Chapter 17: The risotto was bittersweet.

Seven years ago, she freely and easily abandoned ￥100 and ran away, carrying her unborn son with her. Seven years later, she returned with the lady killer’s genius son, never expecting that her darling son would sell her out to MBS International. Unexpectedly, her immediate superior was the Mr. ￥100 from seven years ago!

The empire has turned into the land of the undead due to a spell gone wrong. God summoned heroes from countless worlds to purify the empire and plant new hope. Lee Shin Woo, an ordinary earthling, was also summoned. As an undead, that is.

The Year 1766

Disowned by her own family for their own reasons, she was taken in by a maid at the age of seven to work at the Carmichael's household. The Carmichael's were one of the respectable pureblooded family in Bonelake and like any other household, there were rules. Rules that needed to be followed by the servants and maids.

Like everyone else, she was reminded not to disobey the rules. But before she learns to walk in the shadows like the rest without a whisper, the Duke's young son calls her 'Bambi' and everything breaks loose.

Book cover credit: complxmars

Long Fei, a cross-timer and doujin, is an otaku who traveled to another world. In the original world, he was an otaku fan of Gundam and military science fiction.

He died in an accident and was reincarnated into another world. The Gundam works he had read before his death and the techniques in various military novels could be brought to another world.

How would he use the Gundam that Long Fei created? What waves can be caused in this different world?