Did Daichi and Hana survive?
After doing a bit of research, it seems that they both did survive. In the same regard as to when Daichi fired the Boostedmagnum at the debris, supposedly killing Teppei, Daichi's Livlaster pulled the two into the same place, that Teppei was taken that let him survive the blast. It isn't very well explained, but I believe that the little girl with blue hair is Daichi's Livlaster in human form.