Spoiler warning
(Im not english user, there are many grammar error and some awkward sentence. Sorry)
I think the most victim was Fisher
He suffuered from being ghost over 40years! Very lucky? He is not going to insane or going nut (But a little insane?)
Over 40years, Fisher just want his familiy back and his nomal life. he just want being husband, father and grandfather. That's why he never attempt to kill Spencer.(Thoght he threatening)
And yes, he did many things that never be forgiven. (WorldB) Spencer'father and Spencer tried to stop Fisher and failed. Fisher just did self-defence.(He doesnt want to die. Thats it) Even after that, Fisher want to meet WolrdA Spencer, want to being granfa. He could hide and live as he did but he choose reveal himself. As Fisher said, he has nothing beside his familiy. WorldA Spencer was his last hope.
So in last chapter, he told everthing to Spencer, hoping being understood, being Spencer's grandfa. But Spencer dejected, gathered everyone. Fisher confronted his consequence. Fisher could shoot Spencer but he didn't because he love his gandson. Fisher could surrender but he didn't because now he has nothing... the only thing he had was his familiy but now Spencer is not his side... not his familiy anymore. I think that is why he choose his end.
I read this vn 3times. There are many things i dont understand, cant thread between events. Some mistery can not be fully interpreted. But doesnt matter. This Vn is awsome!