This article or plot contains spoilers from the actual game. If you do not wish to be spoiled, do not read it.
Scavenger Hunt: The Yaoi Project is a side mission in South Park: The Fractured But Whole.
Mr. Tucker states that yaoi, an extremely confusing but modern form of art from Asia has a high worth to the right buyer. He requests The New Kid to collect any yaoi art found all around town.
To begin the quest, meet up with Mr. Tucker at Craig's House, where he'll be seen building a model ship in the living room. Alternatively, you can collect any yaoi art first found across town, he will then later post a message into Coonstagram, asking you to meet with him up.
Talk to Mr. Tucker, he will first ask if The New Kid is one of Craig's friends trying to repair the relationship between him and his partner. He will then explain that he's a collector of yaoi art. He will then assign you to look for any yaoi art across South Park, in which he'll reward The New Kid handsomely if The New Kid does so.
There are 40 pieces of yaoi art to be collected across town, with one extra being given by Mr. Tucker if all 40 pieces has been found, bringing to a grand total of 41 yaoi art pieces. Unlike collecting Chinpokomons from South Park: The Stick of Truth, where some of them can be missed, yaoi art in South Park: The Fractured But Whole cannot be entirely missed; making them collectible anytime in-game; however some yaoi art cannot be collected until certain abilities has been acquired first.
To find out where to obtain the yaoi art across South Park in-game, refer to the page List of Yaoi Art in South Park: The Fractured but Whole.
Note that Mr. Tucker will drop in rewards to your toy chest for every 5, 10, 25 and all 40 pieces of yaoi art found across town (he will notify you via posting in Coonstagram).
Once all original 40 pieces of yaoi art has been found, Mr. Tucker will make a video call to you, stating that you have managed to find the last piece of yaoi art available across town. He will then ask you to meet him up at Craig's House.
Proceed back to Craig's House, where he will give you one extra yaoi art for your collection, also he will reward you with the Big Bang Boy Buttress artifact; the mission will then be fully complete.