Wu Hou Xun Yi Cha

From Chinatown KM:

Tangerine Weekly's new reporter, Koizumi, because of her vibrant hair colour and interesting methods, quickly gains the nickname 'Fire Witch'. During a press conference she realises that the famous singer Senya Kaoru fell asleep. No one believes her, so to prove herself, she begins to design her trap...

Note: This Chinese novel was originally written, serialised, with Japanese names and place names. During publication, the name was changed to "Afternoon Lavendar" with Chinese names and place names.