Man this is such a weird manga. Started as a silly gag manga before revealing a Makima-esque character and some romance sprinkled on top. Now we have this kind of yandere vs yandere arc and honestly, I have no idea where this is going man. 10/10
Edit: Based on my limited understanding of Japanese and Kamen Rider, Ryuusei (his name) means shooting star(his turtle Name) so in a way, that bad yandere already knew his first name really.