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Fukuda Aito lived a peaceful life, his parents' favourite child until the family went bankrupt. His parents died in an accident, and he had to work hard to survive, relatives and friends shunned his as he was considered bad luck. Even at the time of his death, he had the misfortune of intending to help others but instead he was killed. 

It seems like God still loves him sending system 13 to live life as a good person, befriending the protagonist! Help him out of the misfortune, violence, and suffering he faces! Befriend the lonely protagonist! 

The tsudere school tyrant. "Didn't you say you'd be my friend, now you want to break your own promise?"

The cold Major General Alpha. "You are my wife now. We will never divorce."

The possessive apocalypse boss. "If you dare to leave me, I'll throw us both into the zombie pool!"

"System 13, am I still the protagonist's friend now?"

1 vs 1, All gongs are one and the same soul.

Someone has come home