As we all know, Reimu isn't too sure as to how to interact with anyone, being that interactions are not something she is too used to. She did interact with the pups and, at times, Youmu and Chen, yet she was often withdrawn, however, she did often venture out of her shell when curiousity so happened to have struck her. Of course, whenever she did become curious, she would be prone to wandering off.
Something caught her attention and it was something she hadn't seen. A persimmon. Naturally, the object piqued her curiousity and it made her want to find more of them, leading her to wander away. Her curious wanderings attracted the curiousity of the pups, who, one by one, decided to follow her, as to them, persimmons meant treats, in which case, Reimu was leading them to treats. At the same time, to them, she was also there to save them from their mundane lives, so they followed her naturally. Naturally, Reimu was their age-equivelant and acted pretty much as such, curiousity and all.
They followed her for a bit before coming to a persimmon tree. This persimmon tree had a rather thin trunk, thin enough where Reimu could quite wrap both of her hands around it. Said trunk was also rather flimsy as, after the little ones decided to shake the tree to get the persimmons off the branches and while not thinking things through, they broke it after trying to use all of their weight to shake it. Of course, while no persimmons came of the branches, they were ripe and the children opted to bring the tree with them back home.
Humorously, after they brought it home, they opted to shake it again to get the persimmons. Of course, this didn't work out so well, in which case, they opted to just pull them off and put them in a basket, deciding to eat them later.