MTL - I Am Invincible From the End of the World - Chapter 826 training (below)

At the age of 12, Shen Yue accidentally fell into a pond while feeding fish. That’s when she realized that her parents were not her real parents, and her five brothers were not her real brothers either. She was just a fake heiress to the Shen family!

Knowing she was destined to lose everything, Shen Yue decided to just lie down and give up. If she was going to lose it all anyway, she might as well just lie down and relax.

“Big brother, is working at the company fun? Let me check it out,” she thought, wanting to enjoy the perks of being a Shen daughter while she still could. Those luxuries would be out of reach soon enough.

“Second brother, is acting fun? Let me give it a try,” she schemed. What? They pay you just to lie still like a corpse? This is a job she had to get!

“Third brother, is that gun realistic? Let me see,” she said, examining the firearm. Not bad, though the recoil is too strong. She’d need to find a smaller one to play with next time.

“Fourth brother, will the teachers be mad if I sneak into your research institute? Let me take a peek,” she plotted, eyeing her handsome professor. A little hugging wouldn’t hurt!

“Fifth brother, that medicine you’re working on smells nice. Mind if I try a little taste…” she asked casually before sampling it. Tastes good! But now my head feels itchy—I better not be growing a brain!

On the day the real heiress returned, Shen Yue’s five brothers shielded her behind them. “Dear sister, can we keep her with us? She’s a bit slow, it’d be dangerous for her out there alone.”

The true heiress scoffed coldly, masking her sly intentions beneath a guise of innocence.

But in the end, she realized this Shen Yue really was quite dim-witted. Oh well, might as well let her stay.

Dear comrades, masters, priests, masters, fairies, demons, and leaders, welcome to my world and enjoy the supreme pleasure and supreme enjoyment brought by traveling through various worlds (funny laugh).

- Description from novelbuddy

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!