A Local Perspective on Life in Tsukuba, Ibaraki, Japan.

The Fascinating Evolution of Childrens Day ( Kodomo no Hi, 子どもの日)- in a year (2011) in which few carp streamers can be seen flying in this region

Typical of this April- a carp streamer pole stands tall but lonely, without its majestic carp


By Avi Landau



Lovers of traditional Japanese culture usually look forward to April in Ibaraki. After the excitement of HANAMI ( Cherry blossom parties) has died down, there are the amazingly extravagant carp streamers ( koi nobori, which are raised up at  the homes of families with boys), to be admired, and photographed.

Taking carp streamers down for the night- near Lake Kasumigaura


This year, however, out of consideration for the victims of the earthquake and tsunami of March 11th, these beautiful and highly anticipated festive decorations which usually characterize our  spring village-scapes, have mostly been kept mournfully in their boxes (and the cherry blossoms left uncelebrated).

Still, if you take a drive in the country, or even a walk around your neighborhood, you are sure to see at least A FEW of Ibaraki`s usually abundant and very large and colorful koi nobori waving proudly against the blue sky. It is quite a spectacle!

Let me tell you a little about how this, and other customs related to what is now called Children`s Day ( Kodomo no Hi) have evolved.

Carp streamers ( koi nobori) above nanohana and peach blossoms ( Koga, Ibaraki)


When looking into the origins of various elements of Japanese culture, one often finds dual or multiple roots. Even beginning students of The Japanese language are confronted with this fact  as they soon learn that there are two or more ways of reading kanji characters. There are even two ways of counting, the more purely Japanese way- hitotsu, futatsu, mitsu… and then the one based on the Chinese, ichi, ni, san.

It is especially interesting to keep this in mind when discussing Japan’s calendar of traditional annual events.This month’s standout special day is Children’s Day (子供の日, kodomo no hi) which has come to involve a fantastic array of festive decorations and  foods. Most notably, there are the carp streamers (鯉のぼり), which can be seen proudly flapping in the wind (in this part of Japan, we are lucky to be able to see especially large and elaborate ones) or displayed at shops and shrines. Inside people’s homes, or at restaurants and hotels we can see the armor or warrior dolls (Go-gatsu ningyo) which have been put on display.

Carp Streamers (koi Nobori)near Lake Kasumigaura
Carp Streamers (koi Nobori)near Lake Kasumigaura


Now, much less commonly, you can see a plant called shobu (菖蒲, this is a relative of the yam and NOT the  iris – the flower whose name has the same pronunciation and the same Kanji character!) )  on sale for use in the bath, and even more rarely in this part of Japan (though you can still sometimes see it), placed on roofs, along with some mugwort (蓬,yomogi). At wagashiya (Japanese sweet shops) and convenience stores, kashiwamochi and chimaki
are on sale, as the special sweets of the season.

What does all this have to do with Children’s Day?

First let me say something about Japanese festive days in general. Certain days were recognized by the ancient Chinese as being pivotal seasonal markers. These came to be known as sekku (節句)
when adopted by the Japanese. To mark the seasonal changes, each sekku involved eating certain foods and displaying certain decorations. In those times the significance of these was usually one of keeping away bad luck or ritual protection.

The major sekku which are still widely celebrated in Japan are:

January 7: Nanakusa (seven herbs) no Sekku
March 3: Momo (peach) no Sekku
May 5: Tango no Sekku, or Shobu (calamis) no Sekku
July 7: Tanabata
September 9: Kiku (chrysanthemum) no Sekku

(It is interesting to note that the Chinese, and subsequently the Japanese, are fond of ODD NUMBERED days and months)

It now being May, this month’s festive day is of course, Tango no Sekku, which is now known as the national holiday, Children’s Day. However, since this day has been recognized as being special since ancient times, there have been many meanings connected to it which have changed over the generations.

If you ask a Japanese friend about the significance of Children’s Day, they will explain that it is a day to celebrate boys and for families with boys to pray for their healthy growth and success. This goes in tandem with March’s Momo no Sekku which is a celebration of girls. They will also explain that carp streamers symbolize strength and perseverance.

The story of Tango no Sekku, however, is much more complicated than this and its history and the origin of its customs are now unfamiliar even to most Japanese. In ancient Japan (and still today), this is the season for planting rice. To pray for abundant crops and fertility in general and remove impurities from the village young women (早乙女, saotome) would spend a day isolated in a special women’s huts called onna no ie (女の家). This hut would be covered with irises and mugwort, which in ancient China were believed to have purifying powers (because of their strong smells). Remnant features of this ancient practice  can be seen surviving in the Heisanbo Festival held each May 5th at a small Kashima Shrine in Dejima, on the shore of Lake Kasumigaura.

In the Nara Period (710-794), the Japanese would decorate themselves with garlands of shobu and later in the Heian Period it was common (and still is) to decorate homes with these protective plants. At this time tall poles would also be set up by rice fields to welcome the God of Fertility.

Shobu (calamis) Stems and Mugwort (yomogi) On The Roof Of An Old Samurai Residence In Sakura City, Chiba

This photo shows shobu (calamis) stems and mugwort (yomogi) on the roof of one of the old samurai residences which are open to the public, in Sakura City, Chiba.

Later when Japan came under military rule, the Japanese name for the plant  shobu, came to held significant for its homonym, 尚武, shobu, which means reverence for martial arts. Thus, shobu has remained a part of Tango no Sekku throughout the generations and many Japanese still use it in their baths on this day for driving away evil and fortifying the body. It is surprising that most Japanese today confuse the traditional shobu with HANA SHOBU, which are irises. These extremely beautiful puple flowers can often be seen as INCORRECT sympols of Tango no Sekku at shops, etc.

It was during the years of military rule that Tango no Sekku came to be associated with boys. One possible explanation for this can be that it had originally been a day to isolate women, and that left the boys to be celebrated!

Kashiwa mochi with the leaf unwrapped


Kashiwamochi is a pounded rice cake wrapped in the leaf of a Japanese oak. Eating this sweet in this season is an original Japanese custom and signifies the connection between generations, as these trees don’t lose their leaves until fresh leaves appear!

Kashiwa mochi


Eating chimaki, a conically shaped paste wrapped tightly in leaves, is a custom which originates in China. May 5th in China, is the memorial day of the great poet scholar Qu Yuan (屈原, read Kutsugen in Japanese) who was famed for his loyalty. On the 5th day of the 5th month, men would throw offerings into rivers (he drowned in one)
in his honor. At one point, many men at different locations dreamed that it would be better to wrap these offerings in purifying leaves. This became standard practice, and is now common today in Japan.

Raising carp streamers probably is a continuation of the native practice of setting up poles near the rice fields to welcome the rice god. Since Tango no Sekku came to be a day of celebrating boys, Japanese in the Edo Period (1600-1868) adopted the carp as a symbol of success. This is because of the ancient Chinese story of the carp struggling upriver and transforming into a dragon.

Another interesting reason for the samurai to have admired carp was the fact that this powerful fish, struggles desperately when caught, but when placed on the cutting board, it resigns itself to its fate, and dies with what the Japanese warrior class thought to be DIGNITY.

This custom spread throughout Japan and can especially be enjoyed in Ibaraki where farmers often display fantastic and very expensive koi nobori sets to celebrate their male offspring. For those who live in smaller abodes there are appropriately-sized streamers and even tiny origami or cloth carp.

My Own Go-Gatsu Ningyo With Kashiwa-Mochi and Chimaki

Finally, there are the dolls and armour which are displayed. Grandparents often spend thousands of dollars on a display for their grandsons, though if you want some dolls for yourself you can get the
same exact dolls for a song at second hand shops (since many Japanese would not buy or are even afraid of used dolls!). These dolls became popular in the late Edo Period as emulating the Samurai class was all the rage for the merchants and then farmers. These dolls and armour are displayed to pray for boys success and health and can be found in a myriad of forms.

A Tsukuba Spring- Carp streamers and the HII rocket at the Expo Center

After the war, since the day had been associated with warriors, the name was changed to the more egalitarian Chidren’s Day, though girls and boys are still actually celebrated separately.

There are many other, more obscure decorations for this season, but I have written too much already, so go search them out for yourselves.

for an interesting way to spend Childrens Day, see my article-


or go to the marina at Lake Kasumigaura for this event:


or head out to the curious and very rustic Heisanbo Festival –



  • sue says:

    Hi Avi,
    Glad to see you’re back. I got back a while ago, on April 6. We have since moved to Machida, and yes, we have our carp streamers out for our three year old celebrant.

    Welcome back!

  • Mamoru Shimizu says:

    I had shared Koinoboris with my elder brothers. I loved the black one, the largest one ( the father carp) very much. When it was rainy we played with the Koinobori inside the house, entering from the mouth of the Koinobori and crawling along until we got out from the tail or the other way. It was so huge! We could pass by each other inside it.
    Thank you Avi-san you taught me difference between Shobu and Hanashobu(Ayame) which I have misunderstood. Because there is a picture of Hanasyoubu in Hana-fuda( the flower card game) card, it is an Ayame-flower for May,drawn in a very beautiful violet color. I thought Hanashobu = Shobu(green spike like flower).
    Recently my grand-son have been playing alot of Hana Fuda, good practice for him to learn gambling and counting.

    Here is You-tube of the song of Koinobori.

    童謡 こいのぼり 桃太郎