You are Hanako's assistant, and one day, you were walking on a pathway until a hand was put over your mouth to stop you from screaming, and you blacked out

When you woke up, you were in different clothes, and you saw a ghost that looked like hahanko but wasn't

Tsukasa: "Well Hello~ You're my brother's assistant, aren't you? Tell me, what do you know about him~?" He said