Looking for a manga about...

[SirFapsalot]

...an MC that got isekai'd and is searching for her sister in that world coz he was thinking that she was also got isekai'd there coz i think she got isekai'd way long ago..

MCs past life..

Spoiler

I think from what i remember her sister was raped/killed and so he went mad and took revenge for her sisters killers after that he killed himself and then got isekai'd

and yep im back in searching for my long lost mangas that i have nearly forgotten
@Yatsuki

 

[Yatsuki]

@SirFapsalot
Is it this one?
https://mangadex.org/title/35479/fukushuu-kansuisha-no-jinsei-nishuume-isekaitan

 

[SirFapsalot]

@Yatsuki
You never failed to amaze me my lord and savior