What an official account is for, and what it is emphatically not

The channel is built around a person adding a business as a friend, which makes it the most permission-shaped surface in messaging — and the least forgiving of a shop that treats the follower list as a mailing list.

Adding a business is an act, and so is removing one

Somebody scans a code or taps a link to add the account, and they can block it in two taps from the same screen they use for their friends. Nothing about this channel lets a business arrive uninvited, which is why what gets sent has to be worth the tap.

Broadcasts are metered, replies are not

Pushing a message to every follower is counted and charged; answering somebody who wrote first is not. The economics point exactly where the manners already did — send rarely, answer quickly.

Rich menus do more than a paragraph

The channel carries a persistent menu and structured cards under the keyboard, so 'which notices am I on' becomes a tap rather than a sentence — and an assistant here should be reaching for those instead of writing lists.

The preview on the home page

A preview: the LINE thread is drawn in this site's own CSS. No official account is linked and nothing here reaches LINE.

The device drawn there is this site's own CSS — a header, a composer and a screen — and the screen is a SLOT. When you tap one of the quick replies, the live assistant opens inside it and answers you there. Nothing in that frame is a scripted conversation: there is no pre-written customer turn and no canned reply, because a transcript nobody generated would be the page telling you something about the product that is not true.

There is no LINE official account behind this page. Nothing here is broadcast, nothing is added to anybody's friend list, and no LINE service is contacted at any point.
Tsukumo Camera is an invented shop. The address, the telephone number, the email, the staff, the stock, the prices and the subscriptions are all fictional — nothing here dials or reaches anybody.
Subscription changes made here live in memory until this demo restarts. No list is written to and nobody is sent anything.

What changes on the day the channel goes live

One field. This site serves a small configuration file with a single basicId value, null today. Set it once an official account exists; the CTA becomes a genuine line.me link. The page reads it at runtime, so the same build switches from an honest preview to a working LINE link with nothing rebuilt and nothing rewritten.