This reminds me of My Unrequited Love by TMnR, even though Uta's brother is not dead she fell in love with his wife, they divorced and Uta (working member of society) ended up living with the wife...(there was never any kind of romance between them and that grinded my gears) still I enjoyed the...
You are kidding me and here I was hoping to see more of OOkuma's sadistic side ああああああああああああ _(:o 」∠)_
Well if it's the end so be it, I still enjoyed the story full heartedly.