Merri said: The Hinanai were known long ago as the "Hinanashi" -- that is, "Hina nashi" (TN: lit. "no dolls") -- and were famed as a family line that produced no girls, so it's only natural that Chiko would have a pOnOs. (TN: pun here between Chiko, Tenshi's pre-ascension name, and 'chinko', Japanese for 'dick'.)
But the person himself thought that it would be a shame to let his cute figure go to waste and decided to come out as a crossdresser once he became a celestial, flying back to the world once again under the name Tenshi.