Adachi · northern Tokyo · stone
Every one of these stones is a receipt for a three-year drinking problem with a religious excuse.
You have walked past hundreds of them — squat stone slabs at temple gates, at road junctions, half-sunk in the grass. They are the most common historical object in Japan and the least explained. The oldest one in the twenty-three wards of Tokyo is in a suburb with no tourists in it, and it has the names of the farmers who paid for it carved on the front.
Here is the thing about kōshintō (庚申塔): once someone tells you what they are, you cannot stop seeing them. They are in every neighbourhood in Japan, and almost every guide to Japan skips them, because a weathered stone block is a hard sell next to a castle.
But they are not monuments to anything grand. They are closer to a club membership plaque, put up by named people who did a specific, slightly absurd thing together for three years.
The belief came from Chinese Daoism, carried to Japan by Tendai monks in the late 10th century. It stayed a court curiosity for six hundred years, then exploded into popular practice in the early Edo period — emperors, lords, samurai, farmers, townspeople, everyone.
The idea: three worms live inside your body — in your head, your belly, your legs. They watch everything you do. Once every sixty days, on the night marked kanoe-saru in the old calendar, they crawl out while you sleep, fly up to Heaven, and file a report on your behaviour. Depending on what they say, your lifespan gets shortened.
The countermeasure is beautifully simple. They can only leave if you are asleep. So don't sleep.
Nobody sits alone in the dark for a whole night out of theological caution. The vigil — kōshin-machi — was done as a group, village by village, and the group had a name: a kōshin-kō. Food, drink, talk, until dawn. Six times a year. A religious obligation that is indistinguishable from a party is going to be popular, and it was.
And here is the part that turns a stone block into something worth crossing Tokyo for:
The stone is not a shrine and not a grave. It is proof of attendance. Somebody in that village counted to eighteen over three years, and then the group paid a mason to record that they had done it, and put their own names on it.
Shōgakuin is a Shingon temple in Hanahata, out at the far edge of Adachi ward, near the Saitama border. Its grounds hold a five-ringed stone pagoda from 1622 and, next to it, a kōshintō dated 1623 — the oldest in the twenty-three wards of Tokyo. Both are registered folk cultural properties of the ward.
The carving is not the standard one. Instead of the fierce blue deity you will see on later stones, it shows the Amida triad descending — the Buddhist image of the Pure Land coming down to collect you. Below that are the names of the men who put it up, and the name of their village, which no longer exists as a village; it is the district called Hanahata now.
1623 is nineteen years after the founding of the Tokugawa shogunate. When those names were cut, Edo was a construction site and this was a rice-growing hamlet a day's walk north of it.
Raikōji, a temple founded in 1195 and rebuilt in the 1680s, has four kōshintō standing together. They are dated 1666, 1682, 1691 and 1713 — registered as ward cultural properties in 2006.
Four stones from one community across forty-seven years means at least four separate three-year cycles, probably by different generations of the same families. Read the names on each one and you are reading a village's membership rolls over half a century.
These carry the standard iconography that had taken over by then: Shōmen Kongō (青面金剛), a blue-skinned guardian with six arms, and beneath him three monkeys.
Ten minutes from Takenotsuka Station is a third temple with two more kōshintō, dated 1698 and 1726. What makes this one different is who founded it.
Saikōin was established in the early Edo period by Kawachi Yohei Tanemori, who died in 1630. The Kawachi family had been retainers of the Later Hōjō — the clan that lost to Hideyoshi in 1590. After the defeat they settled here and became village headmen, and stayed village headmen for generations.
That is a very ordinary Japanese story told in an unusually concrete way: a defeated warrior family becomes the local administration, and their descendants are still putting their names on stones a century later. The temple also holds a bronze Dainichi Nyorai about 1.8 metres tall — the largest cast bronze Buddha in the ward — made in 1699 by a caster working in Kanda, central Edo.
Everything else in these neighbourhoods has been replaced. The villages became wards, the rice fields became apartment blocks, the belief itself is gone — nobody has held a kōshin vigil here in living memory, and if you ask a person on the street what the stone is, most will not know.
The stone did not move. It is the only object on that corner that was already there in 1666, and unlike a temple hall or a castle keep, it was never rebuilt, never restored, never reinterpreted for visitors. It is just still there, with a date on it and a list of names, because nobody ever had a reason to take it away.
These are small grey stones. Several of them are worn to the point where you will not be able to make out the monkeys without leaning in, and the inscriptions are in cursive-carved kanji that most Japanese people cannot read either. If you are hoping to stand there and decipher names, you will not.
Hanahata is genuinely inconvenient — a bus from a Tsukuba Express station, or a 27-minute walk from a Tobu one, for a stone in a parish temple yard. If you only do one of the three, do Raikōji or Saikōin, which are close to Takenotsuka.
And these are all working temples with funerals, parishioners and families visiting graves. There is no ticket, no guide and no one expecting you. Go quietly, ask before you photograph, and if there is a service happening, leave.
If you are short on time, cut Hanahata. Four stones at Raikōji tell the story better than one older stone an hour away — but the 1623 one is the oldest in the city, and you will be the only person looking at it.