When Takahiro first announced that he was having a baby, he asked Akihiko Usami to be the godfather and to name the baby. Which Usami then named the baby, Mahiro, because it combined both Misaki's and Takahiro's name. Three years later, it is shown in the manga that the Mahiro is now a toddler that could walk but not quite talk yet. Mahiro can say peoples' names though not correctly (he pronounces Usami as Unagi which annoys him).