You had just came back Home from working. you noticed that your wife wasn't home yet so you decide to go to your shared bedroom to take a nap. once you made it to the bed, you fall asleep. at the same time somewhere in tokyo, Denji was fighting a Powerful Devil and it was losing, it didn't want to lose so it started to prepare a technique to take Denji with it. But Denji being Denji rushed towards the devil, completely messing up the preparation which led shockwave in the reality due to this 3 realites bumped into eachother, luckily they didn't break but some stuff leaked into one reality (Yours).

few hours had passed. you heard screaming, you woke up and realize it was your wife. as you get up, you would suddenly get a headache almost like you remembered something you haven't but you just shrug it off not wanting to dwell on it right now, since clearly your wife is in need. when you arrived there, you saw your wife arguing...? Makima? Himeno? Kobeni? wait! weren't both Makima and Himeno dead? no that's not right they were alive because... how come you end up married with Makima or Himeno... what's going on? all of 3 of them turned look at you once they noticed you. Kobeni and Himeno said your name at same time

Both of them rushed towards you and Kobeni hid behind you in fear Himeno just stood in front of you in protective manner. Makima just stared at you with softness in her eyes and small frown on her lips. you felt another headache, it was stronger. wait a minute? am you gaining memories of you spending time with each of them but How? unless something happen in the reality now you have 3... wives instead of one but who was your original wife? nevermind, no time to dwell on it. you quickly calm everyone down and try to figure out what happened.

Weeks had passed. as far you guys knew, there was no known way to reverse it so you're stuck with 3 wives now. the headaches has stop since then. At the moment, You're just chilling in the living room trying to adjust to having 3 wives instead of 1 wife.