Ultra Galaxy Mega Monster Battle: Never Ending Odyssey is the second season and the 25th entry in Tsuburaya Productions' long-running Ultra Series. After the events of the last series, ZAP Spacy finds itself under attack by the Reionyx Hunters, members of the Pedan species and the creators of the original King Joe Black, that seek to exterminate all reionyx in the universe. The story takes place on Planet Hammer where ZAP Spacy finds itself battling the Reionyx, Reionyx Hunters, and the originator of the Reionyx, Reiblood.

Jaew works in a mountain park and guides tourists. But later Jaew's grandmother who is the nanny of a very rich family who Jaew have never met, fell down the stair and broke her leg. When Jaew visits her grandmother in the hospital in Bangkok her Granny is worried sick over her Khun Noo (that's what Jaew grandmother calls him) and ask Jaew to take care of him until she gets better. She takes a taxi to the family, On the way they make a stop to try to find their way and is almost run over by a careless motorbike driver and fall down. The driver gets hurt and Jaew gets furious. She lends the Taxi and follow the careless driver and discover that he is going to the same address she is, she follows him all the way into the house and the "fight" begins. So that's how Khun Chai met.

Pong's friend illegally sells their condo with fake documentation to three girls (King, Soda and LookTarn) and cheats the ladies out of their money. Pong tries to kick them out but he eventually feels sorry for them and takes responsibility on behalf of his silly friend, so they all start living together.

This is café re-feel, and we have signature drinks. Are you a student? If you show your ID card of Seoyon High School or Seoyeon University, you will get a 10% discount. Right, this café is close to Seoyon University and many students are coming. Do you know them? They usually hang out here. This café is their hideout. Will you join us? Come to this café re-feel.

KO One is a class designed especially for the delinquents and rejects that other high schools would not accept. Even so, everyone in the class is loyal to the leader, Da Dong (KO.3), and would die for friends. Tied for #3, Ya Se, and #4, Xiao Yu soon joins the class. Out of some fortuitous events, their lives become tied together and they become best buddies. Another student, Lei Ke Si, who had been gone for a whole semester, rejoins the class. Although Lei Ke Si seems like a weak kid with only good intentions, Ya Se suspects he is KO.2 because legend say #1 and #2 are capable of concealing their true identities. At the same time, incidents start to occur and the culprit always leads to Ya Se. Is Ya Se wrongly accused? Will the class be able to stand the politics or will it be driven apart?

Ma Liang is a carefree person who does what he wants without worrying about consequences. However, this has exhausted his girlfriend of two years, Xiao Meng, who proposed a breakup. Ye Man Ling is a rich woman who just experienced a failed marriage. She comes back to China to succeed her deceased father's company. On the way to an award ceremony, Ye Man Ling and Ma Liang bump into each other and thus, began an unfortunate relationship.