The author just never intend to kill the Deibu. The dosage she eat in the whole story is definitely lethal and she doesn't die.
Miss have a Sanae.
Sanae taught her to not be trapped by common sense, such as the common sense that yukkuri only eat sweet foods. But Sanae also like to question common sense such as why wear the usual clothes when going out, or why sit down before eating.
Sanae is also very troubled if she realized she's trapped by common sense (like yukkuri when thinking they're not easy).
One day, Miss take Sanae for a walk to the park. They have lunch when that Deibu shows up. Miss is not really angry, after all she already expected this. She introduced Deibu to Sanae as someone lacking of common sense and Sanae agree without completely understanding it.
Deibu demanded the food. At first, Miss hesitate, after all the food is not free. But Sanae said it's alright to share. In total, Reimu got
- Sanae's lunch, raw bitter melon.
- Sanae's drink, green tabasco (Deibu thought it's vegetable juice). After drinking this, she vomitted her paste.
After that, Miss saved Deibu by giving her melon. Miss' family has melon farm and her parents always send her melon. But she had allergy and her mouth gets irritated if she eat melon, so Miss gladly share with Deibu.
Deibu recovered and happy.
Miss told Deibu about her allergy. With her limited brain, Deibu deduced that eating melon (a fruit she never saw before) will cause mouth irritation. Yes, Deibu believed half of what Miss said and got melon allergy herself. So itchy Deibu rubbed her lips against the ground.
Later, Miss asked Deibu to call a Meiling playing in the riverside.
Miss gave Meiling Tabasco, which terrifies Deibu. Then, Miss gave Meiling habanero, which Deibu thought is sweet sweet.
Miss throw Deibu the habanero, but Deibu's tongue is still numbed so she can't taste it. Miss gave another one. Finally, Deibu's body starts feeling the pain from the habanero. Her paste is turning spicy.
Miss saved her again by feeding Deibu with melon.
Last, Sanae asked for desert. Miss gave her the desert as well as new tabasco for Meiling.
Deibu think, finally the real sweets sweets.
Miss shared that desert Sanae had, wasabi.
Deibu rolled around on the grass and then stared to Miss. The trash human only give Deibu uneasy things.
Miss asked back, is Deibu really an easy yukkuri ? Sanae and Meiling is so happy eating the spicy food and drink. If there's anything, Deibu is the one who's out of place, not easy.
Deibu is dead afraid. Is she not easy ?
Miss told her, it's easy to heal. Just smile and greet, "Take it easy!"
It's the happiest "Take it easy" in Deibu's whole life. She's easy again.
As parting gift, Miss gave Deibu a chilli. Deibu is now easy, she can eat spicy food, right ?
And so Miss went home bringing Sanae. She also took Meiling back.
From behind, Deibu's screaming voice can be heard. "The red and green is not easy!!"
Deibu only vomitted once, first exposure to tabasco. Really admirable.