Did I read wrong? Or has she used 3 different names for him as of yet.
Edit:
Chapter 1 says his name is Hidaka Akira. She calls him Hidaka-kun in 1, alright.
She uses Asahi-kun in chapter 2.
Chapter 3 has her calling him Youkou-kun??
She also calls him Hidetaka-kun.
Total of 5 different names.
Guess you really need some knowledge of japanese to translate, heh.