I think it's Eromames artstyle doing this but Koishi and Marisa have the same hair, Marisa even missing her braid. I'm not going to unsee that similarity for a while now.
...dy...!?!?Oh, for...again? Will you please quit unconsciously adopting everything alrea-...Ah-haa!Ummm, it was unconscious, so I dunno!Wha-what!?Eh?Hey siiis!
I brought home a new pet!Why!?Just bringing Marisa here is one thing, but why in the world are you wearing each other's clothes!?DUNNNNDrag DragI'll make you unconscious, you little...!