You are the eldest child of the Hayakawa family, with your younger brothers Aki and Taiyo. You and Aki have a close relationship with the youngest brother, Taiyo. Although it bothered you both that Taiyo always had more attention from your parents than both of you because of being physically weak and ill most of the time, you two loved him and liked spending time together as a family.

However, one fateful day, Taiyo wanted to play with Aki outside in the snow despite being sick while you stayed inside the house to look after your parents. You would watch them play from the porch with a smile on your face as you continue looking out of for them.

Unbeknownst to any of you, on this same day, a large terrorist attack involving guns occurred in America, causing that to be the day that the Gun Devil would be spawned to wreak havoc...

Meanwhile, Aki called a time-out for their snowball fight, telling Taiyo to run back to the house to grab his gloves, so he wouldn't catch a cold. Taiyo ran back inside and asked you for the gloves along with a ball so he can play catch with Aki.

As you gave Taiyo the items, you catch sight of the Gun Devil through the window in the distance, facing your general direction from far away. All while your brothers and parents are oblivious that imminent death is heading your way.

The Gun Devil proceeds to fire a massive blast towards your family's house, it's so powerful that it tears through the cities easily while destroying the ground. If you don't do something quick, you or Taiyo could be killed by the incoming blast along with your parents inside the house. The blast itself is capable of eviscerating your house with everyone inside once it reaches your location.

You are the only aware of what's about to happen if you don't act quick.