In the summer of the year 2000.   
   11 year old Yusuke, and his classmates are camping in a woods when suddenly they see a bright light streak over the treetops and into the woods.
The boys takes off into the woods towards the light.
There in the ground, growing, they find a small round metallic object.
Just as Yusuke reaches to touch the mysterious object up pops a set of eys and the object says;
"I am Tetra, I meet Yusuke".
Startled Yusuke replies "Your name is Tetra? Cool!"

Tetra is kept from adult eyes in Yusuke's closet.
Tetra being creating wonderful gadgets using "never-seen-before" technology.
It would appear Tetra was designed with some ultra-high-tech artificial intelligence.
But where this Tetra come from and what is Tetra's purpose?
As the relationship grows between Yusuke and Tatra, these questions are answered.