夢幻伝説タカマガハラ

Fifth-grader Yuuki Wakasa is an ordinary girl with a loud, outgoing personality, caring for her three brothers in a bustling household. One day, a mysterious red stone falls from the sky into her hands, granting her the ability to travel between the real world, Nakatsukuni, and the dream world, Takamagahara, when she sleeps. In Takamagahara, Yuuki learns she is the "Horizon Girl," destined to save the sun goddess Amaterasu from a looming threat that could plunge both worlds into darkness. Joined by four other stone bearers, Yuuki embarks on a fantastical adventure to protect nature and restore balance. (Unreviewed summary by Grok 2)