This isn't the legend of Tanabata, it's the legend of The Princess and The Cowherd, which Tanabata was inspired by.
That's why the album is called Somewhere At The Bottom of The River Between Vega and Altair. Vega is the princess described in the story, and Altair the shepherd. They are supposedly separated by the Milky Way River, which is said to be composed of stars and crosses the sky.
This isn't the legend of Tanabata, it's the legend of The Princess and The Cowherd, which Tanabata was inspired by.
That's why the album is called Somewhere At The Bottom of The River Between Vega and Altair. Vega is the princess described in the story, and Altair the shepherd. They are supposedly separated by the Milky Way River, which is said to be composed of stars and crosses the sky.