Berkisah lima tahun setelah Digimon Adventure tri. Taichi & teman-temannya mencapai usia dewasa. Mereka dikejutkan dengan berita bahwa kemitraan dengan Digimon mereka akan segera berakhir karena mereka bukan anak-anak lagi. Sementara itu, Digimon yang kuat bernama Eosmon muncul merampas DigiDestined. Taichi, Agumon dan semua teman mereka untuk bertarung bersama untuk terakhir kalinya menyelamatkan dunia.
Tai is now a university student, living alone, working hard at school, and working every day, but with his future still undecided. Meanwhile, Matt and others continue to work on Digimon incidents and activities that help people with their partner Digimon. When an unprecedented phenomenon occurs, the DigiDestined discover that when they grow up, their relationship with their partner Digimon will come closer to an end. As a countdown timer activates on the Digivice, they realize that the more they fight with their partner Digimon, the faster their bond breaks. Will they fight for others and lose their partner? The time to choose and decide is approaching fast. There is a short time before “chosen children” will become adults. This is the last adventure of Tai and Agumon.