SeiTenshi are a special type of Volks Tenshi that are not available to be sold anywhere. Rather, Volks gives them away at events as a special prize for event-goers, usually via lottery or bingo, so that the recipients are chosen entirely at random.
They are slightly smaller than YoTenshi, and have a non-jointed torso. Like YoTenshi, they have resin wings but unlike YoTenshi, the wings are permanently attached and cannot be removed. They each come with a random pair of eyes and random fur wig, and their resin wings come in white, yellow, pink and blue. Most SeiTenshi have different faces; there are a variety of headmolds available.
It is very rare to come across a SeiTenshi on the 2ndhand market as Volks gives them away as special gifts and frowns upon reselling them, and most owners believe it an honour to receive one and will not part with it.