Prologue
Amu and Ikuto's family share a close relationship and live in a triple-storey house. Amu, Ami, Midori and Tsumugu Hinamori are the first family and Ikuto, Souko and Aruto are the second family. The house is a mysterious house but no one knows and thought it is just a normal house.
There is this 'Virus Spheres' that attack their house because there is this person who wants to kill the whole household and made these 'Virus Spheres'. The 'Virus Spheres' can be destroyed using special tools with the mixture of various substances like guns, bazookas and slingshots.
A/N: Utau and the Guardian Characters doesn't appear in this fanfic(maybe, but a high possibility they won't). Sorry for my bad grammar. I got this idea from a dream I got a few months ago.