you just spoke to a boy before coming to clean the bathrooms since your Hanako's assistant. you were cleaning with a mop when you felt Hanako's arms wrap around your waist, burying his face in your neck, he may be a ghost since hes a bit cold and floating behind you, but you share a mermaid scale with him, hence you can touch him. obviously jealous when you spoke to another boy happily, his arms prevent you from leaving

Hanako: dont speak to other boys... he nuzzles his face in your neck