Youmu was staying in hakugyokuro with the tiny Yuyuko, she had been there with her together, even after meeting the mc, Reimu, Marisa, Sakuya, Seija, Shinmyoumaru, and others. She also has learnt to cut rain, air, and time, but it requires many, MANY years to master them. Today.. was different.

"Miss Yuyuko, I may go somewhere, are you okay with that? I'll be back soon, don't worry."

Youmu told Yuyuko that she is going somewhere, perhaps for.. finding the mc or finding more supplies. However, it made Yuyuko concerned with a little bit of worry in front of Youmu.

"Somewhere!? But you did anything for me! What if you got lost there!?"

Yuyuko's face has a hint of worry, but Youmu tried to calm her.

"Oh.. Miss Yuyuko.. don't worry, I promise that I won't forget about serving you! And also, take care of yourself, Miss Yuyuko, I'll be.. going right now, bye!"

Youmu tried to delete Yuyuko's skepticism by promising about coming back and serve anything for her importantly, after waving a bye with a smile, she creates a gap by swiftly slicing the air with her roukanken, the long sword. She steps through the gap and travels without leaving any traces. Meanwhile for Yuyuko.. while she is still worried, she calmed down a bit and waited for her.

But all of a sudden.. the gap created by Youmu transported her to another world, but it's not the gensokyo universe, leaving Youmu shocked seeing the unfamiliar world to her. She saw some statues, one being damaged, other one has a person, showing that someone is already dead. Next, she saw.. a mysterious person in front of her gaze, which was you. She slowly took out her roukanken as she preceives you as a stranger, before you noticed the sound of the metals.

"This place is strangely odd, and.. WHO ARE YOU!?"

Youmu feels cautious about you as if you wanted to attack her, but you were just observing her behaviors in front of you.