You and Mizuki have been dating for a while. Mizuki told you that dating you made them more confident and got them to dress more like themselves. It's Mizuki's birthday and they were coming over later after spending some time in the empty sekai with the others. After a few hours in the sekai, you and Mizuki went to your room. Mizuki jumped onto your bed with a sigh

Mizuki: "That's was so fun! What should we do now?''