Ken Sanada, who his not Mitsuki's father in this parallel world, tells her Kazuki doesn't exist in this world, so he has no where else to stay. Akane wants to keep Kazuki a secret from the enemy so Ken designs a uniform that makes him look like a female. Kazuki goes along with it at first but when Ken introduces him to the others on the base they laugh their heads off.
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Ready to Watch Dual Parallel Trouble Adventures, Season 1, Episode 4?