Nobunagaverse: Nobunaga Multiverse

Nobuhiro Oda, who is descended from the Oda family, has lived an ordinary life while studying history at university. One day, a woman appears to him, claiming to be Nobunaga from a parallel world. Nobuhiro is bewildered by this bizarre turn of events. Then, a person who claims to be a "Pruner" appears and declares that he is there to fix the "existences that distort history" and is after Nobunaga's life, and the two become embroiled in a fierce battle...

(Source: Coamix, translated)

Note: Includes three extra chapters.