A favorite of kids far and wide, the Dinosaur Professor, Shinya Makino has arrived in Hoshimoto City. And it seems he wants to investigate the fossil discovered at the mountain ridge. While Yuma is excited to see his childhood hero in action, Hiroshi seems troubled. As it turns out, the Professor was Hiroshi's teacher! Among all this, a lake suddenly appears at the excavation site...

The members from SKIP are working alongside Satoru Yamagami, from the SKIP HQ's Kaiju Analysis Unit. Rin has actually known Yamagami even before joining SKIP and feels nostalgic about their reencounter. However, Yamagami has fallen under suspicion for trading kaiju cells on the black market and Rin decides to participate in the investigation, but...

The conclusion of the Onyx incident meant Shu would be leaving... As his departure approached, a mysterious case emerged! The victims seem to be afraid of something unknown, and the source of it seems to be the beams released from a certain kaiju's hands. What will Shu see when he too becomes a victim? And a mysterious alien appears in the middle of the chaos!?

Ultraman Arc has disappeared into the space rift, following Hellnarak. Who does Yuma meet once he wakes up? When strong feelings break the walls of dimensions, will the fates of both worlds forever change!? Arc's final beam carries everyone's wishes and heads towards Hellnarak!