about the pervert male tree , i read this kind of plot in some henta* before : a virgin male human has only a few months left to live , so he decides to leave his "seeds" behind in this world , as many "seeds" as he can . he wants to use his genes to leave the proof of his existence . he wants to impregnate many girls with his babies .
page 5 : in japan , you need a license to prepare pufferfish meat : https://en.wikipedia.org/wiki/Fugu
page 6 : he is eating sweetpotato/Ipomoea batatas , not potato/Solanum tuberosum .
page 7 : i bet the male trees have "morning woods" every day , lol pun .
page 9 , panel 3 : on his glasses are モブ = mobu = mob character .
page 13 , panel 2 : note that the police sawed off the branches on the head of the pervert tree , maybe his pollens came from there . is this the same as castration ? lol .