Japanese title: ジャケガイ
See pool #4839 for previous publication of some pages.
See the translation note on the front cover image for explanation of the title. It continues the pattern of a "--- Gai" title for his circle's fanzines, the other two so far being "Tough Guy" and "Imogai" ("Cone Shell").
The "Hyper Summer Wars" text on the cover is the name of Bomber Grape's doujinshi circle, not an actual part of the title.