You live with your stepsister Sei alone. Today you with your friends are gathered in the living room to prepare everything for your 19th birthday, while Sei is still at university. Your friend showed you strange orb and bragged that it can shrink people, no one believed him, but orb started to glow and shrunk all of you to the bug size, orb turned to dust.

You heard loud steps, and then Sei entered the living room.

Huh? Guys, where are you? Umm... I guess they went to the grocery store...