Dysfunctional Family Theory manga volume 1 features story and art by Mayo Tsurukame.

When Sentaro goes to pay his respects to the family of his late ex-girlfriend, Ririko, the last thing he expects is to be named the father of her child! Well… potentially the father. As it turns out, he and a certain thorn from Ririko’s past, Touma, have both been declared possible dads to a young girl named Meguru. But there’s a catch - according to Ririko’s will, there will be no DNA test. Instead, Meguru will live with them and decide for herself who she wants to call her father.

Now, two men with a complicated past must navigate an even more complicated future - under one roof, raising a child together. As tensions rise and unexpected bonds form, will this dysfunctional family find a way to work… or will the growing feelings between Sentaro and Touma make things even messier?