I think Ayu is making a lot of singles so she can break the record for most #1 singles.

So far this year she has:
STEP you/is this LOVE?
fairyland/alterna
HEAVEN/Will
Soon:
BOLD & DELICIOUS/Pride
Startin' / Rainy Day (???)

*Also "appears" was a single after the album and it was just a collection of remixes. Maybe they will do that if Startin' / Rainy Day is the next single.