Thats not really bad, just tragic. A bad "yuri" ending would be the boy from the flashback joining their office to get revenge. He manipulates them and makes Kisaki think he and Chishiro are in a relationship. This causes her to fully transform into a tree and he abuses Chishiros sorrow to actually start dating her. After geting married and buying a house they arrange for the tree to be moved to their garden. Except he swaps it with another and makes a bed out of the real Kisaki. They make lots of babies on the bed. 10/10, depressing as fuck, [everyone hated that].
I don't know who you are. I don't know what you want. If you're looking for ransom, I can tell you I don't have money... but what I do have are a very particular set of skills. Skills I have acquired over a very long career. Skills that make me a nightmare for people like you.