青夏　Ａｏ－Ｎａｔｓｕ

Rio, a high school girl who believes in fated encounters, plans to spend her summer vacation in Tokyo but is forced to stay at her grandmother’s house in the countryside village of Ueko. There, she meets Ginzo, a handsome but slightly teasing boy with a mysterious aura and remarkable talent. As they spend time together amidst the sounds of cicadas and flowing rivers, Rio begins to experience the stirrings of a vibrant summer romance. The rural setting contrasts with her urban expectations, shaping her interactions with Ginzo and the local community. Their budding connection unfolds through moments of youthful discovery and emotional growth. (Unreviewed summary by Grok 3)