Anime Crossover: Taking Over a Body to Protect Matou Sakura and Wipe Out the Worm Nest

I transmigrated into the Nasuverse as the Tohsaka Family's adopted son, unlocking the Fake Seduction-Type Soul Possession System from the start!

By rejecting the fake newbie rewards, I could claim the System's highest authority and escape the inevitable fate of previous Hosts: being possessed.

I built up my strength with a unique mechanism that converted emotions into reward points. I could even borrow against the System's shady merchant service, trading a steep debt for a trump card when cornered.

The price was unimaginably cruel. I started with a hell-level debuff that forcibly shrank my body to that of a small child, locking away all my combat power.

I had just said goodbye to my frail, silver-haired younger sister, whom I needed to protect in the real world, when I was forced into a car belonging to the Matou Family and plunged into the most terrifying insect hell in Fuyuki alongside six-year-old Sakura Matou.

The doors were locked, and every escape route was cut off. Tokiomi Tohsaka's betrayal and Zouken Matou's schemes played out before my eyes. The System issued a death-line mission: survive for three days, protect Sakura Matou, and put an end to the Matou Family's sins. With no magic, no combat ability, and no way out, I still had to face a series of hellish trials. My only chance to carve out a sliver of hope and escape the despairing insect nest with the lonely girl was to harvest the emotions of everyone around me and gamble with the price of the System's credit.

This novel and its characters are entirely fictional. Any resemblance to actual persons or events is purely coincidental. Do not imitate.