The following contains spoilers for Episode 6 of Tomodachi Game, «I Really Can't Be Friends with a 'Murderer,'» now streaming on Crunchyroll.
Episode 6 of Tomodachi Game continues from where it previously left off: Mikasa is on his knees after getting exposed. Yuichi, who had appeared dumber than he was, explains that everything had been part of a plan. In fact, after Sawaragi and Mikasa's former romantic relationship came to light, Sawaragi and Yuichi made a plan to work together in secret. Mikasa questions how this is even possible if they barely spoke during the second game. But Yuichi reveals that they were able to plan things out by using the bad-mouth cards and that he was giving instructions through this medium. During his turns to write bad-mouth cards, he would take an additional card to write instructions to Sawaragi and discreetly pass it to her. She would then read the next part of the plan when it was her turn to enter the bad-mouth room.
Mikasa asks Yuichi how he could trust Sawaragi if he didn't know the traitor's identity. Yuichi tells him that he gave her a 'test,' a set of instructions on the first card that told her to use their secret to bad-mouth him (that Yuichi didn't bathe for a whole week one time). With Sawaragi's help, Yuichi narrowed down the culprit to Shibe, Mikasa, or Kokorogi.
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The next person Yuichi approached was Kokorogi. By the fifth period, he slid Kokorogi a bad-mouth card, instructing her to bad-mouth Sawaragi in the next period while she continued 'fighting' with her. This secret was that Sawaragi wears men's boxers. This left two suspects: Shibe and Mikasa. Yuichi's plan was so detailed that he also controlled the group's order entering the
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