Sorairo KaiganSky Blue Beach; Sky-Blue Shore; Skyblue Shore; 空色海岸; 蓝色海岸

Sakurai Tomo is a highschool girl who lives in a town close to a beach. One day, as she was getting molested on the bus, she gets rescued by school related person(!?). However, the key holder dropped by that man held the same Agate that she has gotten from a boy in her past!? Is he the same person!?