It's about a young boy who has the power to defeat aliens, but he somehow forgot how to use his powers.
When Earth is invaded by aliens and the military cannot defeat them, they find a young boy, Kakashi, who can beat the aliens. Somehow, the boy does not know how to use his powers. When Kakashi moves in with the commander, Shiro, Arikawa start a triangle of emotions and relationships.
|Name:||This Boy Can Fight Aliens! OVA|
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|Aliases||Kono Danshi, Uchū-jin to Tatakaemasu.|