Custom's Picks: Gridman Universe

This crossover movie takes place after the two anime shows (SSSS.Gridman and Dynazenon) precede it where The Neon Genesis Junior High Students along with the return of Gauma (pilot of DynaRex), explained to the main cast form both shows that an unknown phenomenon was causing different universes to overlap in a potential Big Crunch, which led to an revesal Big Bang that could destroy every reality. The Dynazenon cast: Yomogi, Yume, Koyomi, and Chise were transported to Yūta's world. While they were happy to reunite with Gauma, they have no way of returning to their universe. So instead, Yomogi and his friends decide to help Yūta, Rikka, and Utsumi with their play while the teams tried to figure out what was causing these kaiju to appear and how to prevent the Big Crunch from happening.

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