Whispers circulate about a peculiar duo at Kamome Academy – the enigmatic Hanako-kun and his newfound assistant, Nene Yashiro, a freshman student. Joining forces, they delve into the school's enigmatic Seven Mysteries while maintaining harmony between the human realm and the supernatural. Amid their serious investigations, Hanako and Yashiro find joy in playful escapades with her classmates and the hidden spectral beings invisible to ordinary eyes.