My Junior Sister Can't Possibly Be the Demon Lord

A sickly junior sister who plays the pig to eat the tiger vs. a tsundere, sharp-tongued senior brother who always has her back

*

Xuelan Yin was the eldest daughter of the cultivation clan Xuelan. She should have been destined for greatness, but she was born frail and could barely cultivate, making her a notorious good-for-nothing.

Even after she entered the Kunlun Sect at seventeen and became the Third Elder's personal disciple, plenty of people still waited for her to embarrass herself.

There was one exception among them: her senior brother, Xie Qingmo.

It wasn't that Xie Qingmo looked down on her. He looked down on everyone in the world.

Xuelan Yin followed Xie Qingmo, carefully asking, "Senior Brother, why am I the only one without a sword spirit?" Her attitude was, "He's my senior brother, after all. I should at least be polite to his face."

Xie Qingmo didn't even raise his eyes. "Junior Sister, have you been sleeping through every lesson?"

Xuelan Yin asked, "Senior Brother, could I borrow a book from you?"

Xie Qingmo gave her a strange look. "Do you think I'm the sort of person who likes reading?"

He might have been a tsundere with a sharp tongue, but when Xuelan Yin's identity was called into question, he stood before everyone and sneered, "My junior sister can't even tie a chicken. How could she possibly be the Demon God's host?"

Xuelan Yin's eyes curved at the corners as tears filled them. She had been about to draw her Yin Xue whip and fight back. "Senior Brother, maybe I should go to the Heart-Testing Pool to prove myself..."

"Why go to the Heart-Testing Pool? The way you are, you'd die in there before they could even ask you anything."

Xuelan Yin: What a wonderful senior brother, blocking every arrow with a clatter!

*

Xie Qingmo couldn't understand why his master had taken in a sickly girl as his junior sister.

How could a sickly girl possibly be his junior sister?

And she was a timid, tearful pushover who let people bully her.

But the sickly girl was rather well-behaved. Though Xie Qingmo complained about her, he followed behind her and quietly dealt with the people who bullied her.

It wasn't until he saw with his own eyes that his junior sister, who looked as though a gust of wind could knock her over, was standing among a crowd of demons with an ancient demonic artifact in her hand, gripping their master's collar with a cold expression, that he realized she wasn't a pushover at all!!

*A side character is a transmigrator. This story follows the same worldbuilding as How to Make Your Junior Sister Yours.

2025.9.15

Theme: Remember the lofty ambitions we held in our youth, and how we vowed to be the finest of all.