A restaurant called "Roast Beef Ohno" is expected to open in early October.
The location is on the B1F of the building that houses Jiromaru Akihabara, a stand-up yakiniku restaurant that opened at the end of August in the area behind the old Zakon, near the Kentucky Fried Chicken Akihabara store.
According to the job posting, "Excellent! A bowl of roast beef".
It is believed to be operated by the same company as Jiromaru Akihabara.
[Postscript]
Grand opening on October 15. The main menu includes a roast beef rice bowl set meal for 1,080 yen, a Wagyu roast beef rice bowl set meal for 1,512 yen, and a draft beer (medium) for 500 yen. The set meals come with pickles, soup, and condiments, and a large serving of rice is free. Open from 11:00 to 22:00 (*open until 21:00 on Sundays).