Yuta and his friends attempt to unravel the mystery of the city and everyone else's memories. However, more questions arise when a strange samurai arrives and tries to tamper with Gridman.

A field trip takes the class away from the city for some summer fun, but when trouble occurs so far from home, there's no easy way to get to Junk.

The others are finding Yuta's story hard to believe. Nobody wants to confront and ask Akane, but in the meantime, Anti has made plans of his own.

Disaster strikes on a morning like none other and it's hard to tell friend from foe. Akane seems to have all but given up, but Alexis has other plans in store.