I Just Want to Deliver Normal Takeout

I'm terrible at writing introductions, so give the story a try first.

Chen Feng: a transmigrator from China, an ordinary food-delivery worker, and a high school student in Japan. The Causality System has successfully upgraded. Food Delivery System loading... Huh? Why does this suddenly feel so much less impressive? Is this the legendary reverse upgrade?

The System is assigning orders...

"A vengeful spirit has appeared at the Yukinoshita residence. Address: XXX. Request: Deliver the spirit out of the Yukinoshita residence. Notes: None. Accept order? Reward upon delivery: storable weapons case (5 m³), AR-15 assault rifle, 500 rounds of M855A1 ammunition, and some cash."

"Sawamura Eriri, daughter of a former British diplomat in Japan, has been kidnapped. Address: XXX. Request: Ensure the hostage's safety and escort her to safety. Notes: Extra cilantro, no scallions. Accept order? Reward upon delivery: the ability to turn back time by 5 seconds (once a day), Beretta M92F pistol, 300 rounds of 9x19 mm ammunition, and a large sum of cash."

"Terrorists have appeared on the grounds of the private Toyosaki Academy. Address: XXX. Request: Send the terrorists to meet God. Notes: Apple pie. Accept order? Reward upon delivery: Quack Doctor's Medical Kit (once a day, can heal injuries and illnesses of any severity), and Dragon's Heritage power."

You call this food delivery?