The monster Houlinga appears at the edge of Sakane Village, but it does not show any intention of harming the village. The village's people then make the monster a tourist traction, however when Houlinga seem to be growing weak the village's mayor asks Xio to help the monster.
A little girl named Hana Suda is spending her time at her village's prayer shrine, anxiously waiting for her father to return while looking at an old piece of paper that tells an old folk tale. When her friend Chizuru comes to take her home, Hana refuses. A shock wave suddenly occurs, and when Hana and Chizuru leave the shrine they see a strange monster at the edge of their village. Hana names the monster Houlinga.
One month later at Xio HQ, Daichi Oozora presents the information of Houlinga; since it's appearance at the village, named Sakane, Xio has investigated the monster and learn that it only stays in one place at all time and won't move from it, acting as a plant, other than that it seems docile and Xio see no reason to consider the monster a threat to the village people, and have Sakane's approval to monitor and protect Houlinga. However Houlinga suddenly seems to be getting weaker, and the people of Sakane have now requested that Xio help Houlinga.
Daichi, Asuna, Wataru, Hayato, Rui, and Mamoru are sent Sakane Village with the medical supplies provided by Xio's Research and Development section. The people of Sakane have made Houlinga into their village's prized tourist attraction, and the village's Mayor, Yamato Suda, Hana's grandfather, is anxious for Xio's help. When Xio prepares the ampule full of the nutrition for Houlinga, Hana interrupts them saying that the monster isn't sick. Daichi tries to stop the operation but is unsuccessful. With the added nutrients forced into it body, Houlinga's roots begin to grow at a rapid pace, causing destruction in Sakane. Even worse, the nutrition injection given to Houlinga begins to accelerate and resulting impact would cause its tentacles covering the whole Sakane village in 24 hours. Guruman reveals that an antidote does exist but the effect would take about 2 days.
Remembering Hana's words, Daichi goes to find her while Asuna discovers an empty lot for Houlinga to be placed on while waiting for an antidote. At first Mayor Yamato refuses due to the monster being a centrepiece of his village until the destruction of Sakane village's other attractions (observatory tower, bridge and the mayor's statue) changes his mind. Daichi learns of Houlinga's name origin from Chizuru and warms up with both Hana and Houlinga but when Xio officers tries to relocate the monster, Hana pleads Daichi to stop them as Houlinga likes sitting next to Sakane. Hana drags Daichi to the shrine and shows him an old caricature of Houlinga. In the past, Houlinga's species came to Sakane and turn into the very mountains of the village. Hana shows him three mountains which were once his ancestors.
Angered by Xio, Houlinga turns aggressive and releases pollens on a wide scale, affecting the villagers. Daichi unites with Ultraman X and first encases Houlinga and himself in a barrier to prevent its pollen from spreading. He later unleashes Purify Wave to remove the medication. Finally, the cured Houlinga peacefully turns into a mountain, allowing it to join its brethren. Yamato and Chizuru approach Hana as they inform her of her father's return.
Daichi's Monster Lab
- Daichi: Daichi's Monster Lab! This time, we're looking at this monster.
- X Devizer: Analyzing, Houlinga.
- Daichi: This is Houlinga, it appeared in the Sakane Village. A peaceful monster whose pollen can be a bit unpleasant for humans.
- X: And this Cyber Card is Ultraman Max. The same Ultraman Max who fought alongside us before. I'm sure the card he gave us will help Daichi and I again some other day.
- Daichi and X: We'll, see you next time!
- Daichi Oozora (大空大地 Ōzora Daichi): Kensuke Takahashi (高橋健介 Takahashi Kensuke)
- Asuna Yamase (山瀬アスナ Yamase Asuna): Akane Sakanoue (坂ノ上茜 Sakanōe Akane)
- Wataru Kazama (風間ワタル Kazama Wataru): Yoshihiko Hosoda (細田よしひこ Hosoda Yoshihiko)
- Hayato Kijima (貴島ハヤト Kijima Hayato): Ukyou Matsumoto (松本享恭 Matsumoto Ukyou)
- Mamoru Mikazuki (三日月マモル Mikazuki Mamoru): Hayato Harada (原田隼人 Harada Hayato)
- Rui Takada (高田ルイ Takada Rui): Haruka Momokawa (百川晴香 Momokawa Haruka)
- Takeru Yamagishi (山岸タケル Yamagishi Takeru): TAKERU
- Chiaki Matsudo (松戸チアキ Matsudo Chiaki): Chiaki Seshimo (瀬下千晶 Seshimo Chiaki)
- Sayuri Tachibana (橘さゆり Tachibana Sayuri): Sarara Tsukifune (月船さらら Tsukifune Sarara)
- Shotaro Kamiki (神木正太郎 Kamiki Shōtarō): Yuu Kamio (神尾 佑 Kamio Yū)
- Ultraman X (ウルトラマンエックス Urutoraman Ekkusu Voice): Yuichi Nakamura (中村悠一 Nakamura Yūichi)
- Ultraman X (ウルトラマンエックス Urutoraman Ekkusu Suit Actor): Sakaekei Iwata (岩田栄慶 Iwata Eikei)
- Alien Fanton Guruman (ファントン星人グルマン Fanton Seijin Guruman Voice): Yasunori Matsumoto (松本保典 Matsumoto Yasunori)
- Alien Fanton Guruman (ファントン星人グルマン Fanton Seijin Guruman Suit Actor): Hiroyuki Fukushima (福島弘之 Fukushima Hiroyuki)
- Yamato Suda (須田大和 Suda Yamato): Yuu Tokui (徳井 優 Tokui Yū)
- Chizuru Ueki (植木千鶴 Ueki Chizuru): Misato Hara (平田 弥里 Hirata Misato)
- Houlinga (ホオリンガ Hooringa Suit actor): Hiroyuki Arai (新井宏幸 Arai Hiroyuki)
- Alien Fanton Guruman