In the World of Sword and Magic as Space Marine - Chapter 50: Gotta Catch Em All

This is a prequel to the anime movie To Aru Majutsu no Kinsho Mokuroku – Endymion no Kiseki.

Just before the completion of the Academy City space elevator “Endymion”, the main characters Kamijou Touma and Index encounter a level 0 girl named Arisa. The Magicians are after Arisa, and they attack Academy City. A female leader named Shattoaura leads a unit from Academy City against the attack. Kamijou and Index learn from Stiyl that Arisa is key to a brewing war between the sides of Magic and Science. When science and magic cross paths, the story begins with Endymion as its stage!

It was only after Su Yayan's death that she realized that she was a malicious cannon fodder female character who became a scapegoat in a Mary Sue story.

There’s an ancient saying in Great Ruins, ‘Don’t go outside when it’s dark.’

The fake daughter was spoiled by her elder brother and parents, but she, the real daughter, was disgusted to death and scolded as trash, she endured it… But what happened this time? After the rebirth cycle, the eldest brother who hated her the most hugged her and said that he loves her. Is she his only sister? Several other elder brothers sent the most expensive gifts one after another, just begging her to take a second look? This plot is not right?

Brothers:

“Yanyan, do you eat candy? Big Brother bought it for you all over the country and put it in a candy house.”

“Yanyan, do you like this house? The second brother bought dozens of houses for you.”

“Yanyan, the third brother of the playground has been transferred to your name.”

“Yanyan, my brother will take you to debut at C position.”

Gu Yan: “…” (Help! She really wants to do the task in a low-key manner!)

- Description from novelbuddy