It’s the ultimate showdown. The toughest fighters from “Baki Hanma” and “Kengan Ashura” clash in this unprecedented, hard-hitting martial arts crossover.

“That’s a hassle.” That was second-year high schooler Nagi Seishirou’s favorite phrase as he lived his dull life. Until Mikage Reo, a classmate who dreamed of winning the World Cup,…