Shichigosan (七五三) is said to be derived from the ancient customs of "Kami-oki (髪置) at age 3, "Hakamagi(袴着)" at age 5, and "Obi-oki (帯解)" at age 7.

Kamioki (髪置) was a ceremony for both boys and girls, and on that day, they began to grow their hair long. Hakama-gi (袴着) is a ceremony for boys to put on hakama for the first time, and "obi-no-ki (帯解)" is a ceremony for girls to start to put on an "Obi" for Adults (帯） instead of the "Tsuke -himo"（付紐) for an infant.

At Shichigosan, everyone celebrates the child's safe upbringing, expresses gratitude by visiting the kami and ancestors who have watched over us and prays for the child's healthy growth in the future.