Story
OVA — Summer 1993, 6 episodes, Finished.
A gigantic meteorite landed on earth a few years back. A mysterious capsule believed to have belonged to the aliens was discovered. Called the "black box," an international organization called "Project BB" was created to research it. Eight boys, including Manabu Yoshimura, attend International Academy, a school located near Project BB headquarters. They are enticed by their teacher Toukichi Hashiba's promise of "I'll give you class credit", and end up getting involved in his experiment. The experiment was to enter the eight empty chambers of meteorite.
Synopsis via AniList (English).
