Well, I always shut my brain off when reading ridiculous manga and doujins so I really have no problems with this one.
Maybe if the end involves being hitched with Paperplane girl. I would crack up though if the "real" and "fake" father were twins. That would just be golden.
I could see "real" father making an appearance, however. Either they get disqualified, or "real" father isn't wanted in the family once the bonding commenced.
Last page, chapter 2. Most want.
... Please, Protagonist... Do it for the grades.