When a mysterious portal called the 'Gate' emerges in Tokyo, unleashing monsters and chaos, the Japan Ground-Self Defence Force intervenes. Youji Itami, a 33-year-old otaku and JSDF officer, leads the Third Reconnaissance Team into the 'Special Region' beyond the portal to engage with its inhabitants. As they navigate through cultural discoveries and challenges, forming bonds with unlikely allies like an elf, sorceress, and demigoddess, they face not only enemy forces but also diplomatic tensions from global superpowers eyeing the region's resources. While the outside world sees the Gate as a strategic asset, for Itami and his team, it represents a unique chance to expand their horizons and foster genuine connections amidst a backdrop of geopolitical intrigue.