Bio Planet woO

A mysterious comet was approaching Earth. However, the comet suddenly exploded in a massive, mysterious blast, and Captain Gonda of the Defense Force, who had been sent to investigate, went missing... Around the same time, a middle school girl named Ai Kamishiro found a strange object in a park on a hill and brought it home. That night, a mysterious creature emerged from the object. The next morning, Ai decided to take the creature to school...

Just as danger closed in on Ai, the mysterious creature began battling the monster. Although the creature barely managed to defeat the monster, Ai, as the sole survivor, was taken into custody by the Defense Force. She and the mysterious object were to be investigated by Dr. Nagakura. What actions did Ai take as she sensed the threat to her own safety...?

Ai found herself taking refuge with a group of homeless individuals. Although each of them had their own struggles, they lived their lives to the fullest every day. There, Kotaro also rushed in, rejoicing at Ai's safety. However, the monster reappeared and attacked Ai and WoO. At that moment, WoO...!

Continuing their life on the run, Ai and WoO met a woman named Marou, who had come from abroad to work. However, all their money was stolen. Ai and WoO chased after Marou, but it turned out that she was also being pursued by the yakuza. Moreover, Ai herself was being hunted by the Defense Force... As they were both on the run, Ai gradually began to connect with Marou on a deeper level...

While visiting the town where she used to live, Ai reunited with her childhood friend Ayumi. Ai pleaded with Ayumi that WoO was not at fault, but she was unable to understand. Meanwhile, Dr. Nagakura of the Defense Force had discovered that the monster and WoO were of the same kind and shared an astonishing theory...

Upon learning that WoO and the monster were of the same kind, Ai felt shaken. After much contemplation, she decided to abandon WoO. Meanwhile, Kotaro was heading toward the Arakawa area, where the monster and Aikichi had appeared, determined to save Ai. The Defense Force was also on the move... The gun of Sakuraba was aimed at Ai. Would WoO and Ai, as well as Kotaro and Ai, be able to reunite?

Dr. Nagakura, who was possessed by WoO cells, successfully created a more powerful WoO cell and injected it into his own body. Meanwhile, a staff officer named Weber arrived from America, determined to vigorously advance the capture or extermination of Ai and WoO. Shion, who questioned this order...

Continuing their life on the run, Ai and WoO took refuge in a dilapidated apartment where a pregnant woman named Seiko lived. For Ai, it was a long-awaited place of comfort. Meanwhile, Staff Officer Weber, without informing Yamanami, had his aide Maria contact Ai's mother, Kiyomi. During this time, Ai and WoO, who were staying with Seiko, found themselves caught up in the chaos of childbirth...

Ai and WoO's existence had become known throughout Japan. In the wake of a series of events, the public mistakenly believed that these incidents were the fault of Ai and WoO, putting them in a desperate situation. However, by a stroke of luck, they found refuge with a young elementary school student named Yuta. Meanwhile, Dr. Nagakura was attacking humans one after another to realize his ambitions... During this time, Kotaro was also experiencing strange changes in his body...

Ai, who was being sheltered by Yuta, collapsed due to a high fever. Meanwhile, Colonel Yamanami, who had detained Staff Officer Weber, sent Kirishima to rescue Ai. On the other hand, Akita from the scientific magazine "Chemistry" was also hurrying to the warehouse where Ai was being hidden. Will Ai be able to reunite with Kotaro?! And what are the strange changes occurring in Kotaro's body?

Since the day Ai found WoO, which had fallen from space, she has been tormented by a series of harsh destinies. The destruction of her middle school, the separation from her mother and Kotaro, the pursuit by the Defense Force, the attacking monsters, and the "human hunting" initiated by a fearful populace. Ai has overcome these numerous trials, reflecting on the path she has taken thus far.

The reunion with her mother was brief, and Ai resolved to fight alongside the Yamanami Unit of the Defense Force. Meanwhile, Nagakura approached Ai and WoO, determined to become the strongest being. Amidst this, the truth behind the comet explosion was finally revealed. The final battle began between the monsterized Nagakura and WoO, who transformed into Aikichi!

Aikichi was swallowed by the monsterized Nagakura. Nagakura's declaration of victory echoed loudly. Still, Ai, who believed in WoO's survival, shook off Yamana's restraint and voluntarily entered the monster's body. At that moment, WoO's heartbeat revived inside the monster, and a miracle occurred!