According to legend, the Inukai Star is recorded as "Kegyu's Japanese name is Hikonohono and also as Nakhihono" in the mid-Heian period dictionary "Wamyo Ruijusho Tenbu Daiichi" written by Minamoto no Jun. It is also said that the first Inukai Star was recorded by Nishiyama Mineo in Kajicho, Fukuoka City (current Tenjin 3-chome) around 1939.

The Amakusa Island Folklore describes Inkaiboshi as follows:

"Once, he was ordered to sow some gouts of millet in a field several steps away. He went to the field and scattered the seeds, but some was still left behind. Tanabata was weaving at the time, but Inkai became angry at his poor work and threw the shuttle at her. Inkai also became angry and cut a melon in the melon field where Tanabata had planted it in half. The melon turned into the Milky Way and separated the two of them. After that, the two of them would meet once a year on the night of the seventh day of the seventh month by crossing the river."

Koichi Kitao recorded Inkaisan from a speaker from Keya village (now part of Itoshima city) in Kafuri, Itoshima city, Fukuoka prefecture.

"Tanabata-san, between the Milky Way, Inukai-san, Inukai-san."
"The three Tanabata suns form a triangle. The other, the Inkai suns, are lined up in a row. They are sandwiched between the Milky Way."

Inkaisan is a dog keeper, and is the star Beta and Gamma that are aligned with Altair in Aquila. Tanabatasan is Vega Lyra and the stars ε and ζ. If it rained on Tanabata, Inkaisan could not meet Tanabatasan.

"If it doesn't rain on Tanabata day, I'll be happy. I'll be happy with Tanabata-san."

On Tanabata day, we prayed for it not to rain so that Inkaisan could meet Tanabatasan.

On Hamahiga Island in Okinawa Prefecture, it is called Insoya-bushi (Dog Companion Star).