@CivD666 My theory, it's a hidden target on the hero, because this rainbow bridger thing is most certainly Ryugamine's doing. The move to use plastic bottles as the delivery mechanism on a national or bigger scale is sure to cause a pollution problem, which reeks of humanity destruction schemes to draw out Tsubasa. HOWEVER, it's a fun world peace thing so the idea is to have it blow up (socially) in the hero's face when she goes to sabotage it, and make her the bad guy which could potentially damage her persona thingy like when demon lord decided to try smashing a place.
I do NOT want to know what made Ryugamine think the sweet release of human waste would be a viable corruption method.