From VIZ Media:
When the alien Mimics invade, Keiji Kiriya is just one of many recruits shoved into a suit of battle armor called a Jacket and sent out to kill. Keiji dies on the battlefield, only to be reborn each morning to fight and die again and again. On his 158th iteration, he gets a message from a mysterious ally--the female soldier known as the Full Metal Bitch. Is she the key to Keiji's escape or his final death?
1 Volume (Complete)

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This shits on the medium called "Light novel".
This novel feels like a real book with real characters and development.
Even though the narrative is very main-character centric like most LNs, the plot calls for it.
No fluff will be found here.
The manga adaptation is alright, but it misses out on a lot of details, especially the amazing world building this provides.
My only (tiny) beef is how many moe/tropes the author felt compelled to layer on the female mechanic... oh Japan...