This is basically a FanMade Story of Murder Time Trio and Touhou. This is not something on their canon stories. Hope you Enjoy!
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Touhou Project belongs to ZUN
Undertale belongs to Toby Fox
After the fight, we had with other magician. We save Flandre from the barrier circle. She explained about with her past that, she locked up in the basement for 495 year. And I explained better way my past too her. Why I was here and also must be stop her sister. She looking with sad reaction, but then I cheer her up that I can play with her before, I leave. She's now more cheerful, and then we go to where her sister was. Her big sis and the Lady of this mansion, Remilia Scarlet. The Vampire Who Can Manipulate Fates.
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Not gonna lie, I was stressing about with this a little, but for others I take this risky mission.
Remilia:"Hmm? Flan? I told you that, you need to stay in your room. Now be a goo-" before she can continue, I inturupted her.
Horror:"Yea, yea, blah blah. What kind of sister are you, can I ask? She explained that you're locked her in basement for 495 year. Are you even actually care about, your sister?" I said.
I start to feel some aura start to came up from her. But I also don't hesistate to show my aura either. Me and Remilia looked eachother for a few second then she finally spoke:
Remilia:"I can tell that for a skeleton, you can talk big from a person that stronger than you." She said to me.
Horror:"Stronger or not, the most imported thing about battle is intelegence." I responded to her.
Remilia:"Then... It is decide, I suppose." She said and start to send some projectiles.
I made a wall of sharp bones to cover us. Then I look at them and say:
Horror:"Ready?" I asked.
They both nodded. And then I summoned a Gaster Blaster to shoot at her. She dodge the attack but then Marisa start to send artifical style stars to her. Flan was readying for an advange too a rushing direct hit. I was send bones to her but, she was fastly dodge them. I see Marisa get some injury from her attacks. Then I cast a basic heal spell, I learned from the book I got in library. Her Injuries are healed, then she also start to send some projectiles, until:
Marisa:"Love colored sign, MASTER SPARK!" She yelled with some blast attack like mine.
But unlike mines, her attack literally destroyed the whole wall. Flandre attack with a rushing direct attack to Remilia with her sword, but Remilia stops her with a purple glowing spear. They both got out from the room to the outside. Marisa followed them and I summoned a Gaster Blaster to follow them as well. I summoned a few blaster to not hit Flandre, but Remilia. Flandre realize my attack, and she fly backward. Remilia look at me and saw my attacks and dodging them, until Flandre attacks her again. When she attack Remilia, she get hitted blaster I summoned too able to follow them. She paralyzed a bit, and then Flandre finish the job with her attack. We were win against her. And when we defeated her, the sky start to turning normal. Me and Marisa realized this, so we take them cover into some shadows. I use my blaster half to cover Flandre, and Marisa got Remilia to some wall part that she destroyed. Flandre was cheerful that, we defeated her sister. But that was a '1 to 3' fight, of course. Also with the spell that I learned and the the gap lady help, it was way easier. Flandre talked:
