Maybe NG life by mizuho kusanagi. I read this 10 years ago, when I was highschool. Lol. Sorry if I got the wrong one.
http://www.mangago.zone/read-manga/ng_life/
This is an excellent read. I really enjoy the characters, comedy, and emotions. Enjoy!
You got the right one!!Omg i also used to read this years ago that's why i almost forgot this story exist.But thank you regardless (≧∀≦)
Thank you so much!!I finally found it （/TДT)/ .It's been bugging me at the back of my mind and i finally found it.
I don't remember the exact storyline but
I think the MC got reincarnated from era centuries ago(?) Like those greek mythology kind of era and when he remembered his previous life, he was very eager to find his lover being reincarnated only to found out it was a guy(?) And his parents being his sister and the sister's lover(which he hated(?)).The lover was dead by being trapped in a disaster hence the phobia of dark.If i'm not mistaken at the end MC didn't end up with the said lover.
Thank you beforehand!!!(๑•ㅂ•)و✧