Kono Danshi, Uchuujin to Tatakaemasu.  

Kono Danshi, Uchuujin to Tatakaemasu.: Bokura no Sekai no Mamorikata, That Boy Can Fight the Aliens., This Boy Can Fight Aliens, หนุ่มเทพปะทะเอเลี่ยน, この男子, 宇宙人と戦えます., この男子, 宇宙人と戦えます. ~僕らのセカイのまもり方~, Konodan

If extraterrestrial beings suddenly attack earth, it appears that humanity is at a disadvantage until one member of the defense team, arikawa, stumbles upon an unconscious teenager named kakashi on a hill. surprisingly, tests reveal that this teenager possesses the ability to defeat the invaders. however, kakashi has also lost his memory and therefore lacks the knowledge necessary to utilize his powers effectively. to help kakashi, arikawa brings him into his own home and shares his living space with commander shiro. this arrangement inadvertently creates a complex emotional and interpersonal dynamic that could jeopardize earth's future. as kakashi grapples with his motivations, the fate of the planet hangs in the balance.