Tập 4: Sumi, Sonoko và Gin đối mặt với khủng hoảng Vertex trong chuyến dã ngoại cấp 3

4

Sumi Washio, Sonoko Nogi, and Gin Minowa are going to their elementary school's class trip. The three of them are put in a crisis because of the Vertex's advanced action whom appeared as if to shatter their fun everyday life. (Source: Amazon)