Tanabata, the Japanese star festival (originating from Qi Xi Jie) according to Kore Wa Zombie Desuka:

When the river of stars flows across the sky, a legendary man comes with his two beasts

Wearing clothes covered in the blood of his victims, he carries a sack large enough to hold a person

Under the cover of darkness, he enters homes marked with bamboo trees standing like chimneys

This killer Santa Claus will grant the wish of anyone with a pony tail

WTF!? lol

Now originally it should be like this

In late summer, the stars Altair and Vega are high in the night sky, and the Chinese tell the love story of the beautiful girl Zhinü and the boy Niúláng

Just do a search on it for more specific details :P