According to traditional custom, the mother's family provides these items, but nowadays more and more families do not strictly follow this practice.
Of course, there are still many grandparents who wish to give May dolls or carp streamers to celebrate a child's first seasonal festival, so it is important to discuss and make arrangements with both sets of parents.

Generally, it is common to set them up on a clear day between the spring equinox and mid-April, and to keep them displayed for a month to a month and a half, until Rikka (the beginning of summer) in May (around mid-May). (As some regions and families follow the lunar calendar, please celebrate according to your own family's traditions.)

Additionally, some families choose to put them up on Taian, which is considered an auspicious day. There are no strict rules regarding when to display the koinobori; it is perfectly fine to put them up at a time that is convenient for you before Children's Day.

Please display them from your child's first festival until they turn seven.

There is an old saying: "Children until seven are under the protection of the gods." In the past, it was rare for children to grow up safely until the age of seven, so it was believed that until then, they belonged to the gods, and their fate was left in their hands. Therefore, there is a tradition that once a child safely reaches the age of seven, the carp streamers have fulfilled their duty, and they are retired as a gesture of gratitude to the gods.

Formally, there is no set rule on how long you should display them.
Some continue to display them until milestones such as age 15—the age of adulthood in ancient times—or until they feel the time is right, while others continue to display them as a seasonal tradition for the sake of local children.

Since "Koinobori (carp streamers) / Nobori flags" and "Gogatsu-ningyo (May dolls) / Kabuto (helmet) decorations" have different meanings, many families choose to display both.

Koinobori embody the wish for your child to grow up healthy and successful, like the carp swimming majestically through the sky, representing **"a wish for healthy growth and worldly success."**
Gogatsu-kazari (May decorations) are displayed as "amulets" to protect your child, reflecting the wish for them to **"escape misfortunes such as illness or accidents and grow up strong."**

It is generally considered desirable for each child to have their own.
If you already have koinobori (carp streamers) at home, some people choose to add an extra streamer with the child's name, or add more carp to the set.

The same applies to Gogatsu-ningyo (May dolls); some families choose to display them side-by-side by adding extra name placards.

It will not lose color due to rain, but dirt may become ingrained due to factors such as acid rain.
Also, as this accelerates fading and deterioration of the fabric, please avoid flying it on rainy days.
If it gets wet from rain, please dry it thoroughly right away.

Dry your carp streamers and banners thoroughly and store them in a place with low humidity.
Be sure to clean the poles, wipe them down well with a dry cloth, and lubricate the moving parts of the arrow wheel and pulleys before putting them away.

Trying to force a repair on broken carp streamers or damaged parts may lead to further damage.
If you wish to fly your carp streamers again, please feel free to consult us via [Contact Us].
Please also consult us if the carp streamers are torn.

When disposing of broken parts, please do so in accordance with your local government's regulations.
If you wish to hold a memorial service for your carp streamers, please apply through our [Gratitude (Memorial) Service Proxy] service.