What any anime protagonist would, help out!

Touya decided that this was the right moment to insert himself into the conversation, and walked into the alleyway. "Sorry to interrupt!" he stated, getting their attention. "But do you have a minute?"

"The hell do you want?" one of the thugs demanded.

"Actually, my business is with those two," Touya said, pointing to the girls, getting them confused for a moment, before he continued, "That crystal horn thing is worth one gold right? Mind selling it to me?"

The armored girl immediately brightened up. "If course, it's yours!"

"The hell are you all deciding on your own, this is already mi-!" the thug holding the horn tried to interject, only for the horn to shatter as Touya struck it with his bare hand. "...what!?"

"It was "already mine," so I decided I could do whatever I wanted with it, right?" Touya asked, before reassuring the girls, "Don't worry, I'll still pay for it..."

"Bastard!" the other one shouted, pulling a big knife and rushing Touya. Although "rushing" was a generous term, given that he seemed incredibly slow to Touya's enhanced body and senses. He easily leaned back, letting the attack whoosh right over him, before kicking the legs out from under the thug. While the man was down, he slammed his fist into the man's gut, causing the guy to ****, before passing out.

Touya then turned towards the other thug, only to see the armored girl had already taken care of him, her armored fists having beaten him senseless. "Not too bad," Touya whistled.

...

A bit later, the three of them were back at the inn, discussing why they had been doing a shady transaction in the first place. The unarmored girl had apparently been against it, but had been overruled by her sister. They had managed to gain a reputation for beating Crystal Deer and getting their horns, so had gotten a lot of requests.

The armored fisted girl sighed and said, "I guess that unless a request comes from the guild, it's best to just not take it. So we should register at the Guild tomorrow, right Linze?" she asked her sister.

"Of course!" the now named Linze said excitedly. "Seems like the safest way for us to make money!"

Touya mulled over what he had just heard. A guild huh?