Who did Yashiro call "Chestnut?"

It must be the little man who used to work for Hirata and turned coats.. there were two of them remember?
they were the ones driving the car and going to Yashiro's But Doumeki hit him and took his place..
Here:
http://www.mangago.me/read-manga/saezuru_tori_wa_habatakanai/mf/6ba770cf8927a77ff194ed50229a1153_chapter-15/pg-8/
it's this page and the ones after it..

But where do you think Yashiro was going, why did he have to beat up Nanahara?

Well, when Nanahara saw Yashiro making that ohone call he protested saying that Yashiro was going to run on his own and try to solve things all by himself...I suppose Yashiro either beat him for his impertinence or because he didn't want to put him in danger by taking him along.
As for where Yashiro is going, I don't really know.. I guess we'll find out in the next chapter..

Chestnut is part of a team of Hirata's mercenary muscle. Chestnut doesn't have a name, but when we see him he's always eating a bag a chestnuts. So Yashiro calls him Chestnut.

Thank you for your responses. I followed this chapter so much better than the past few because I took notes throughout to keep track of characters and affiliations. I probably need to go back and re-read several chapters.