Japanese culture and hip-hop have a long relationship, from the genre’s mid-90s kung-fu obsession to Kanye’s mid-oughts evocation of Japanese pop art up through its current commingling in the very production of Drake’s ubiquitous “Hotline Bling.” The Chicago emcee Sir Michael Rocks has always been a nerd, but in his new video “In My Mode” he goes the full cosplay: it’s essentially a three-minute homage to modern shonen anime. The first half is a back-alley brawl, all close-ups of eyes and stylized violence, recalling Akame Ga Kill and Sword Art Online. The rematch takes place in an open field, and is…