Hoshi Ni Negai Wo! 4 (Kadokawa Tsubasa Bunko)

[Machine Translation] My name is Hiyo Hinata. I was doing a secret job with my favorite friend, Makoto, but he told me he doesn't want to be my "guardian" anymore. But she told me that she doesn't want to be my "guardian" anymore... I have to do the spells and search for Sera's master by myself. Then, one of my classmates from the track club asked me to revive the traditional "Hyakudo-sairi Run". But the participants of the run are cursed one after another! Who is the culprit? This is the fourth volume of a romantic comedy of sibling rivalry! From intermediate level of elementary school.

わたし、日向ヒヨ。大好きなおさななじみの真ちゃんと、ヒミツのお仕事してたんだ!だけど、わたしの「保護者」でいるのはもうイヤだ、って言われちゃった。...ひとりでも、おまじないもセラのご主人さま捜しもがんばらなきゃ。そんな中、陸上クラブのクラスメイトから、伝統の「お百度参りラン」を復活させたいってお願いされたの。だけど、ランの参加者が次々に呪われて―!?犯人はだれ?主従関係ラブコメ、すれちがいの第4巻!?小学中級から。