終末のワルキューレ異聞 呂布奉先飛将伝 1巻

A manga where the gods decide that they will eliminate mankind. With the help of a Valkyrie, humankind gets a fighting chance. The art is well done and the story is okay. Among the matches you will get to see are:

Lu Bu vs Thor
Adam vs Zeus
Kojiro Sasaki vs Poseidon
Jack the Ripper vs Heracles

If these match ups sound interesting to you then definitely give this one a try. I'm glad I did!