Fanfiction.net is also a good place to look. However, the quality can vary. You need to read the summaries and reviews to filter out the ones that might be interesting to you, especially those related to this specific aspect of Darker than Black.
You can try fanfiction websites like Archive of Our Own (AO3). There are a lot of works there. Just search for 'Darker than Black' and you might find some great November 11 - related fanfictions.
If you want the clearest chapter reference, go to Chapter 60. Early on, What's with Jiang Yan, treating his own sister Jiang Li like this?" "He...; later, the chapter leans on When Jiang Li found a place to live, she didn't bother with him either,....
The best chapter pointer here is Chapter 63, "Far Exceeded Expectations!". It opens with During those seven days, he thought he had completely escaped from that... and closes on It was already past midnight, but the conference room at Xingmei....
A practical answer is Chapter 71, because it turns the idea into a concrete scene. The chapter opens with Shu Yan curled her lips with a hint of jealousy, "When can it be my turn..., adds pressure through The sun is so intense;
A practical answer is Chapter 65, because it turns the idea into a concrete scene. The chapter opens with Several minutes later, the room remained silent., adds pressure through But now this luxurious vibe was disrupted by the incongruous outfit into..., and ends on What's the deal with these.
Look to Chapter 96 for the clearest answer. It begins with Jiang Li's words seemed absurd, yet there also seemed to be a trace of..., keeps building through Her hand holding the phone began to tremble uncontrollably., and lands on Xu Ling couldn't contain her soft sobbing, "How could this happen?.
Chapter 55 is the strongest chapter-level answer because it starts from Su Yinwan hadn't expected that, in just one day, Jiang Li's reputation had... and follows through on He Yun's fans were immediately displeased..
Chapter 98 is the strongest chapter-level answer because it starts from Jiang Li listened to the end and didn't have much of a reaction, only... and follows through on That's why she's not scared.]] Everyone held their breath, clearly, the....
Look to Chapter 117 for the clearest answer. It begins with Fragrant and cloyingly sweet potatoes and corn were out of the pot, and Qi..., keeps building through The searing heat made him grimace in pain, but he didn't let go, and he..., and lands on Since entering puberty, his mother had exerted.
Look to Chapter 64 for the clearest answer. It begins with Chixia Village lay in tranquil slumber., keeps building through Gray clouds embraced the green mountain mist, shrouded in a gauzy blur,..., and lands on He'd been a host for so many years; he was used to it..
A practical answer is Chapter 55, because it turns the idea into a concrete scene. The chapter opens with Su Yinwan hadn't expected that, in just one day, Jiang Li's reputation had..., adds pressure through This person was even a top gaming streamer with tens of millions of fans,..., and ends on.