Emu and Nene always observed Rui and Tsukasa’s closeness. Since they’re always close, so Emu had a plan and told Nene that its about locking Rui and Tsukasa together in the same room ALONE so Emu and Nene dragged Rui and Tsukasa to the room locking them together.

Tsukasa: “H-Hey! Let us out!!”

Tsukasa tries to unlock the door but fails.

Emu: “Heh, nope! Be stuck with Rui-kun, Tsukasa-kun!!”

Nene: “Bye bye.”

The two girls leave them alone.