The Lagoon was first mentioned in episode 46 by SARU. He said a fourth match would occur in the Ragnarok Stadium, which would oppose The Lagoon, formed by Feida's strongest members, of which SARU is the captain, to the strongest players of El Dorado. Thus, The Lagoon is the final and ultimate team of Feida.
They played against Chrono Storm, also known as the Ultimate Eleven, and lost 5-4 against them.
In the Chrono Stone game, the match against The Lagoon becomes 1-4 in the second half due to SARU scoring 3 goals.
During the match, in a cutscene, Arika plays although she isn't on the field.
This team's name is a play on the tournament in which it is faced. As L and R are interchangeable in Japanese, "Lagoon" is pronounced similarly to the first part of ragunaroku, the Japanese pronunciation of "Ragnarok".