Not the same as business prosperity
Japanese separates two things English runs together. Shobai hanjo is the prosperity of an enterprise — the shop, the company, the trade. Shigoto-un is the fortune of the individual doing the work: a promotion, a job found, a project that lands. Amulets are sold separately for each, and asking for the wrong one is the kind of small error that a visitor makes and never finds out about.
If you are employed and asking about your own career, you want shigoto-un. If you run something, you want shobai hanjo.
Why Kanda Myojin is the case to understand
Kanda Myojin is the tutelary shrine of a hundred and eight neighbourhood associations covering Kanda, Nihonbashi and the Otemachi–Marunouchi business district, and of the Toyosu fish market. That is not decoration; it is the shrine's actual constituency, and it explains everything about the place. Companies book group prayers there. The amulet range includes protection for IT equipment, which reads as a novelty to visitors and as a straightforward extension of the same logic to the electronics district next door.
Watching a suited delegation from a company receive a formal prayer at the start of a business year is one of the more informative things you can do in Tokyo, and it happens in plain view.
How to ask
The ordinary sequence. Two things worth knowing if you are nervous, both from Kanda Myojin's own FAQ, which is unusually relaxed: there is no fixed entrance or exit and you may approach from any direction, and visiting the subsidiary shrines is optional — recommended only where you feel some connection, rather than worked through as a checklist.
That permission is worth carrying to other shrines too. The anxiety about doing it in the "right order" is largely imported.
