They do... however...

As Ren walked, he noticed a slight commotion in one of the stores - a small ramen shop. One he and Ryuji had visited on occasion. It wasn't their favorite - in fact it wasn't even good - but when they needed something in a pinch it was there. And inside, sitting in her matching white underwear, was Sadayo Kawakami slurping down noodles. Her eyes were glazed over as she continued to eat. She polished off the bowl as Ren approached her.

Ren had no idea what Ryuji ACTUALLY said to Mishima, but he imagined the conversation started with Mishima complaining about his clothes, or the showers in the gym, and Ryuji said something like "just strip down to your underwear". And while she was following that command, he probably also said something to the effect of "go get some ramen"

And so Sadayo pulled off her clothes and went to the nearest Ramen shop.

As Ren approached, moving towards the crowd, he saw her mutter something and stand up, marching out the other entry point of the shop.

"Wait... was there MORE?!" he grumbled as he pushed through the crowd, trying to catch up to her.

By the time he **** his way through the gawkers - some of who were still following her (thankfully without filming) he was a fair distance away from her. He needed to catch up and stop her. Though... part of him WAS curious what else she would do.