Incest

Brother x brother

Dad×son

The one and only true love of 15 yrs old DAD and 17 yrs old SON!! (O‿O)
The time travel circumstance caused this beautiful pure love. so it's not exactly 'Incest' to me, it's just 'Destiny'. Who knows? If they hadn't had relationship, son wouldn't have been even born.

≪≫ It's incredibly sad but somehow there's a clue of happy ending awaiting for them. [Spoilers].. On page 25-26 Satoru tried to protect his imbecile bro Tooru till the last minute, didn't bring Tooru to involve by lying that his drunken mom regularly beat him..
Anyway, Tooru already gave testimony about their mental-disorder mom sexually abused him, all for Satoru's sake so Satoru'll be free soon, it's just the matter of time according to the law. That letter i

The precious moments of Katsuya & Tooru being together are so beautiful & heartwarming. While the accident scenes where a 5 years old kid took his craft off to wipe blood for his critically injured mommy made me cry a bucket! ╥﹏╥

➽ In Ch.8 Kuroda came back long ago, living in his perfect life but had never contacted Tooru.. That bastard contacted them after 12 years just for scheming to destroy their happy life because he's about to die.. Instead

Uncle × nephew (in name)

Cousins

Step brothers

Step brothers

Host × yakuza Step brothers