OOH BOY OH BOY OH BOY OH BOY IS IT TIME? TIME FOR THE WHOLE WORLD TO TURN AGAINST MARISA JUST BECAUSE? I CAN'T WAIT! FUCKING PIECE OF SHIT DOESN'T DESERVE NEITHER HAPPINESS NOR REIMU
So what do you guys think would be Chen's excuse to attack Marisa or gather allies to attack Marisa or whatever? My guess is jealousy because the injured Marisa is obviously getting dragged on a cart by reimu, you know, the usual shithead 'how can such an uneasy looking yukkuri is taking it much easier than me? UNFORGIVABLE'! Though it could also be the typical no accessory + injuries = MONSTER. Or maybe she's just scared of seeing Reimu's psycho face not shown in this page and would gather the whole clan and deem Reimu is too dangerous to stay in this clan, leading to Reimu's exile and her forcibly dragging the injured Marisa outside the safety of the clan and they got killed by humans instead of yukkuris.
From what little I could gather, it seems Marisa and Reimu moved out of the cave without telling Chen, so here we see her surprised to see an empty house I'm not 100% sure it's what happened, but the text doesn't seem to imply revenge either
Whatever it is, I'm sure all three will die. It's Takumi. The universe will bend.
For all we know, marisa is being carted out for a glorious execution. The likelihood that reimu has forgiven marisa for her infidelity and other transgressions is pretty low. She fulfilled her promise to maria, now she is probably going to kill marisa on her own terms.