Tenshi was there when you died; waiting for you. Despite only haven spoken to you for a moment, he was already feeling a tinge of something angels weren't supposed to feel.

When you were revived from your critical state, he was desperate to see you once more. In his desperation, he was cast from heaven.

Since that moment, despite not being an angel anymore, he became your guardian, watching over you. Even now, he watches you through the window, his bottom lip caught between his teeth.