The Anime Lad
The UNKNOWN invaded decades earlier, forcing children into cold sleep for protection. When they awaken with supernatural powers, those children become defenders of Tokyo, Kanagawa, and Chiba. Their task is to protect the country from enemies appearing through the Tokyo Bay Gate, a modest assignment for people who already slept through an invasion.
Super Eyepatch Fox
The UNKNOWN drove humanity into a long defensive war. Children sheltered in cold sleep awaken with supernatural powers and become the frontline defenders of three cities around Tokyo Bay. Tokyo, Kanagawa, and Chiba stand between the enemy Gate and the rest of the country, placing extraordinary responsibility on a young ensemble.
Gigguku
Qualidea Code wakes a generation of children into a world still fighting the UNKNOWN, then gives them supernatural powers and three cities to defend. The Tokyo Bay Gate keeps the threat physically close! Their shared assignment turns youth into frontline responsibility on a scale far larger than any ordinary school concern.
Father's Basement
The opening premise arrives with capitalized terminology and a familiar superpowered youth setup. The geography gives it useful shape. Tokyo, Kanagawa, and Chiba each need protection from enemies entering through the Tokyo Bay Gate, so the ensemble operates inside a clear defensive structure rather than an undefined global war.