Upon arriving back into the Digital World, Tai and Agumon find themselves in the exact place they were transported to Japan and are surprised that the rest of the group is no longer there. Tai gets a signal on his digivice and they follow it, hoping to run into one of their friends. They soon find Tokomon, who is on his own but has T.K.'s digivice and crest. After Tai questions the whereabouts of T.K., Tokomon tells Tai what has been going on ever since he left the Digital World. Tai is surprised to find out he has been gone a lot longer than then the one day he spent in the real world. Because time flows differently in the digital world he has actually been gone for weeks, even months and in his absence the team gradually split up to search for him. Sora was the first to depart on her own, followed by Izzy, then Joe, and then Mimi, which left Matt and T.K. by themselves. Matt did his best to keep T.K. feeling alright about the split up group while they continued their search for the others. They found an abandoned theme park and Matt decided to ride a swan shaped boat around the nearby lake. He said he’d only be gone a few hours, but a week later he was still nowhere to be found. One day, a Digimon named DemiDevimon showed up, claiming to be a former servant of Etemon, and told T.K. how he met Matt, who was supposedly glad to get away from him. Then Tokomon, doing his best to comfort his partner, lashed out at the ‘formerly’ evil digimon, causing a falling out between him and T.K. Tokomon left on T.K’s orders and kept his crest and digivice while T.K. went off with DemiDevimon.
After Tokomon finishes updating Tai and Agumon, they head for the amusement park, where they find T.K. who seemed to be upset about losing his partner. T.K. is overjoyed to see Tai again along with his digimon partner but they start to fight again. When Tai tries to comfort T.K., the young boy asks to be Tai’s little brother instead of Matt’s, because Matt abandoned him. DemiDevimon soon turns up with some 'mushrooms of forgetfulness', which he got from some Gazimon. He plans to have the group eat them, and they seemed thrilled they he has brought them food, seeing as they are quite hungry. Tai cooks the mushrooms and when Agumon goes to the washroom he gets a warning from a mystery voice not unlike Sora's (who is revealed to be hiding in the bushes nearby) that the mushrooms will cause them to lose their memories. Agumon arrives with the news of the poisoned mushrooms just in time to save Tai and T.K from eating them. DemiDevimon’s plan is found out, and Tokomon and T.K. repair their friendship. Tokomon then digivolves into Patamon to teach the deceiving digimon a lesson and after a battle through the amusement park, DemiDevimon is defeated. Tai, T.K. and their digimon partners then set off to find the rest of their team.