Taiyou Ouji

Noriko has led a protected life since she was a child, unable to lead the life of normal kid due to her affluent background. Until an organized school trip to Osaka when she meets Taiyou who eventually changed her life.

(Source: MU)

Included one-shots:
Volume 2: Naniwa no Hatsu wa Koimonogatari, Sore wo Bokura wa Koi to Yobu, Attaka Frozen