Natsukawa Tora transmigrated to Type-Moon. He couldn't use magecraft, had no connections, and was busy working part-time. He thought he'd be the most pathetic transmigrator of them all, but everything changed after the Holy Grail chose him and he summoned King Arthur (Proto).
Especially after the Holy Grail War ended, Proto became his [special combat unit], and he became the Proto Saber-Man.
One day, in Chaldea, in that same familiar hallway, at that same familiar corner.
"Sajyou Manaka, stay back! I'm not close to Arthur, really! Emergency call! [What do I do if my friend's old flame is hunting me down, Merlin?]"
[My advice is to lie flat and wait for death, dear.]
(I'm bad at writing blurbs, so please read the story.)
(Volume 3 goes off the rails. Feel free to skip it; it won't affect much.)
