"You need to stop doing that," Tzuyu said as she hid behind a wall with a girl in front of her.

The latter smirked, "Stop doing what, Tzuyu?" She asked as she took a step forward.

Tzuyu held her hand up to stop the other girl and sighed."You're really making my work much harder than what it was supposed to be, Sana."

Sana huffed as she leaned closer, "Isn't that what demons are supposed to do? Do whatever it takes so you, angels, fail whatever your job is?"

The angel just stared at the girl. 

"What? Cat got your tongue?" Sana chuckled as she leaned closer and whispered beside Tzuyu's ear. "If you think that pulling me away from Dahyun would make me stop what I'm doing, then you have to do something better than that." She then the angel's earlobe, making the girl shiver in her place. 

Sana leaned away and blew a kiss at Tzuyu before strutting away.

Tzuyu just stared at the girl who was walking away from her. She sighed in frustration and kicked a pebble near her. "I hate that girl." 

If you think that angels aren't supposed to hate anyone as it is a sin, well, Tzuyu knew that. But she just can't help but just despise the demon as soon as she saw the dark wings that were attached at the back of her. And that was when she knew that her time in the human world would be close to hell.

When she was first sent to this world, she was given a scroll of what she should be doing in her time here. She was also given a name.

Kim Dahyun. 

The girl who she sworn she would protect from all evil. When she went to look for the girl in the university she studied at, she walked around to see if her target was there.

And, alas, Tzuyu heard someone call Dahyun's name. As she turned around to look for the girl, her eyes met another. Eyes full of mischief. That was when she noticed a dark aura around the girl and wings that were wide open around her and Tzuyu's target.

Tzuyu didn't notice that her eyes were full of contempt and hatred as she continued to stare at Dahyun and Sana.

That was when the war between the demon and angel has started.

Tzuyu tried to take Dahyun away from Sana by doing different things, like playing in the arcade, walking around the park, going home after classes together, and other things. Just to take her away from the demon.

But Sana did the same. She invited Dahyun to different places that could make the poor girl do sins. 

Everytime Sana would pull Dahyun away from Tzuyu, the girl would feel her stomach churn at the sight, thinking that maybe she hates how Sana was making her job harder.

That was when she thought that she needed to do everything to keep Sana away from them. Even her.

One day, Tzuyu and Dahyun were walking home from the university when Sana popped out of nowhere. 

Sana leaned to Dahyun and the girl became flustered as she realized who it was. 

Tzuyu noticed this and sighed as she softly pushed Sana away from Dahyun. "What are you doing here, Sana?"

"Me?" Sana pointed to herself, "Why, of course, I'm here to accompany you both home!"

Tzuyu rolled her eyes, "I think we're fine with just us both."

Sana smirked as she looked up to Tzuyu. "Oh, really? Is that true, Dahyunnie?"

"U-Uh, y-yeah. It's alright if you come with us," Dahyun stuttered.

Tzuyu looked at Dahyun in suprise but sighed at the end. "Fine."

Sana's eyes flickered in happiness and excitement as she clung onto Dahyun's arm. "Let's go!"

Tzuyu shook her head as she followed the two on their way home. She watched as Sana flirted with Dahyun and the other girl just getting flustered and blushing as they walk.

When they arrived at Dahyun's house, something happened that suprised Tzuyu and made her stomach churn like she felt that she was close to vomiting.

She kept it all to herself until Sana detached from Dahyun, as the girl went inside her home. Tzuyu bid her goodbye and she walked away from the place. 

Tzuyu bit back a sigh as she felt Sana skip to her side. 

"So, where are we going?" Sana asked as she looked up at Tzuyu.

The latter just closed her eyes before opening them. "I'm going home. I don't know about you, though."

Sana pouted at the response. She thought to herself for a while and was silent, that Tzuyu was geting concerned at the out-of-place silence form the demon.

Before she opened , Sana's head snapped up and hopped in front of her, which made her stop.

"I know a spot. Come with me."

Tzuyu didn't expect for herself to follow Sana to the ice parlor. But, here she was, sittng in front of Sana as they chow down their respective ice cream.

Tzuyu stared at Sana for a while as the latter was enjoying her ice cream with a little bit of a mess around .

'She's like a child who's happy with ice cream.'

Tzuyu shook her head as she pulled out her napkin and waved it in front of Sana. Sana noticed what she was doing and blushed as she realized what Tzuyu was doing. 

The demon snatched the napkin and wiped with it before giving it back to Tzuyu.

Tzuyu hid it back in her pocket as she leaned her chin onto her hand. 

Sana realized that Tzuyu was tsaring at her and was not eating her ice cream. "Are you not going to eat your ice cream?"

"Why are we here?" Tzuyu asked another question.

Sana slumped her shoulders as she continued to eat her ice cream. "No reason. Just wanted to eat ice cream."

"With me?" Tzuyu pointed to herself. Sana nodded. "Why? Aren't demons supposed to not interact with angels."

Sana frustratedly sighed as she set her spoon down. "Who cares about the rules? I'm a demon, I don't do rules."

"Still though, there are things to be followed-"

"Just stop it." Sana closed her eyes for a moment. "I just want to. That's it."

Tzuyu leaned back onto her chair and she looked at Sana who was visibly upset and frustrated, unlike earlier when she was still flirty and mischievous.

Minutes passed by and Sana suddenly stood up from her seat. Tzuyu looked up at her and saw that Sana was a little bit calmer than before.

"Where are you going?" She asked.

"To the park." Sana then gave her hand to Tzuyu, "And you're coming with me."

"Eh?" Tzuyu was suprised at the sudden command but nonetheless, accepted Sana's hand and stood up from her chair.

They were now walking down the road beside the park, side-by-side. Silence surrounded them as they continued their trip.

Sana pointed to a tree in the middle of the park. "Let's sit over there."

'Okay, this is getting weirder,' Tzuyu thought as she followed Sana under the tree. She sat a meter beside the other girl.  

Sana noticed the distance and chuckled to herself. Tzuyu glanced at her in confusion.

"What?" Sana shook her head. She patted the ground beside her. "Sit here. Come on, I don't bite."

Tzuyu was reluctant but followed anyways. She sat on the ground that Sana pointed out. Sana immediately laid her head on her shoulder as soon as she sat down.

Tzuyu stiffened but relaxed when Sana spoke.

"Dahyun confessed to me earlier," she whispered softly.

Tzuyu didn't know if she heard it correctly or what. "What?"

"She said she had feelings for me." Tzuyu hummed when she heard this.

"What did you say?"

Sana laced her fingers with Tzuyu slowly, trying to see if the latter would pull away. But, fortunately, she didn't.

"What will you do if I say yes to her?" Sana turned the situation around.

Tzuyu's eyes widened a little bit as she thought a little bit. "Disappointed?"

"Why would you be disappointed?" Sana asked as she backed away and looked at Tzuyu.

"Because I didn't do my job properly? That I let Dahyun fall for you?"

"Are you saying that I'm not worthy of Dahyun's love?" 

Tzuyu rubbed her nape. "No. That's not what I mean."

Sana's eyebrows met in the middle and the girl stood up. "What do you mean then? That I would her and her emotions up if I say yes?"

"No," Tzuyu sighed. "I'm saying that, you, a demon, would ruin her at some time in the future."

"Tzuyu, just because I'm a demon, it means that I can't love her back just like how she felt for me. I am capable of loving someone." Sana pointed to herself.

"I know," Tzuyu sighed and bowed her head down. "I can't explain it myself," she whispered.

Sana glared at the angel who was against the tree. "You know what? I'll show you that I can love her." She then walked away.

"Yeah. And you can finally replace me," Tzuyu whispered to no one.

The next day, Tzuyu watched as Dahyun and Sana became lovey-dovey with each other, kissing each other's cheeks, and saying I love you's.