One day in the distant future. Humans live shoulder to shoulder in “colonies” separated by rock. Outside the colonies, a dangerous undeveloped area called “the Labyrinth” is expanding. Those who risk their lives to develop “the Labyrinth”, who mark out the undeveloped areas, are known as “Markers”. A young girl, Memempu, who wants to be a Marker one day, and a man, Gagumber, who used to be one. This mismatched father and daughter now take on the Labyrinth! “If there’s no path, dig one!”
Memempu is a Worker in the underground city of Pinyin, but dreams of becoming a Marker and going off to explore the wild tunnels known as the Labyrinth. On the night of a festival, the Marker duo Walsh and his daugher Lynda return, and Memempu receives a surprising gift. Will she finally be allowed to pursue her dream?
Memempu deciphers the pendant sent by Urorop, revealing it to be a detailed map of the Labyrinth. But before she can head out, a kaiju attacks Pinyin. Her father Gagumber activates a bot he's hidden in the warehouse district, and they face down against the kaiju together.
Memempu finally reaches the Labyrinth and wants to take the shortest route to their goal, but Gagumber continues to shoot down her suggestions. Their bickering only stops when a kaiju attack leaves them separated.
Gagumber and Memempu are arrested in the colony of Jolly-Jolly. They're allowed out for sightseeing while their punishment is determined, but a chance encounter with a woman named Zackletu leads them to bigger trouble!
Memempu and Gagumber are free once more... until they're caught by the Yuri team, a gang of young miscreants based in the Colony of AreYaar. The kids take them back to their home base and teach them the secret behind the Colony's supposed equality!
The jungle heat in the Labyrinth makes things hard going for Team Memempu. But it gets even worse when a sudden downpour leads to flooding that sweeps them away to an isolated island!
Merooro brings Team Memempu to Dream Colony to reward them for their aid against Shibito. But a night that should feature a performance from the Colony's foremost diva turns into a farce when the girl escapes her handlers and goes on the run!