Something strange happens at Rin’s favorite shopping street. The culprit seems to be a rat, but it is not just your ordinary rat. In search of the cause, Rin finds herself in danger, and it’s time for Arc to respond with his imagination!

Kazuo, Yuma's classmate and amateur radio aficionado, has found a shred of happiness in his gloomy life by communicating with someone called "Fio" every night. Unfortunately, the waves used in their correspondence have accidentally summoned "Noiseler" from space! Will Yuma be able to protect Kazuo after learning the truth about Fio?

After working and solving so many cases together, Shu seems to have really become a part of SKIP. But wait... He's been writing a report to the GDF late at night!? While revisiting the memories of previous incidents, one by one the SKIP members join him in a discussion about Ultraman Arc. What are their thoughts on Arc?

Kaiju continued to appear from the space rift even after Zangill's fight. In order to put an end to the seemingly endless fight, Shu creates a plan involving both SKIP and the GDF. Unfortunately, they absolutely need Ultraman Arc's help for it to work... Will Yuma be able bring the plan into success!?

Yuma has been experiencing some mysterious strain on his body recently. Right then, yet another galactic beast appears! It seems to know Arc's powers well, and chases after Yuma... With nowhere to escape, what will be Yuma's decision!?

And what is the true form of the ominous light in Yuma's chest!?