Manatsu no Grey Goo

The sci-fi survival manga is about three high school friends: Manatsu Kurashiki, a member of the school's Kendo club; Tsumugi Midorikawa, who streams live videos of insects; and Ayano Yamaji, who likes reading about occult topics and urban legends. The three friends fail their exam, and they have to attend a supplementary class on the first day of...