High School DxD, Vol. 7 (light novel)

Odin, the chief deity of the Norse pantheon, has come to visit Japan on important business, and Issei and the gang are tasked with keeping him safe. Guarding a lecherous old fart of a god is tough enough on its own, but to make matters worse, Akeno's estranged fallen-angel father has also been asked to protect Odin. As Issei searches for a way to help the two reconcile, disaster strikes in the form of Loki, another Norse god, who isn't too happy about how Odin's been running things. It's been said that the Red Dragon Emperor has the power to best deities, but will that truly be enough this time? Our hapless hero may need some help from the most unlikely source...