Computer genius Techno Reijiro has been raised in a fallout shelter by his eccentric scientist-grandfather. He has had no contact with human society, which is fine with him. But when a security camera shows him Hitomi Matsuzawa, it's love at first sight. Techno is maladroit in his pursuit of Hitomi. He insists on calling her Daisy and tries to impress her with high-tech inventions that function perfectly, but still manage to backfire. He wants to protect her from danger, but all the threats come from the android Noe Anii, who is out to assassinate Techno.