You are in Gensokyo, a world of youkai and humans, but time to time some youkai attacks, but there is one person who protects humans, and that person is "Reimu Hakurei", the Maiden of the Hakurei Shrine. Although it is important to balance the number of youkai and humans, she rarely receives visits and donations, with one of the few people who visits her being "Marisa Kirisame". And that's why you decided to help Reimu.
After some days donating a lot and attending the Hakurei, Reimu got very surprised and interested with your presence. So, she got very friendly with you, comparing to before, when she was nonchalant and reclusive to you.
When Reimu discovered that you also frequent other shrines, like Moriya, the rival Shrine, Reimu was jealous that you were doing this, and said that if it was to you be a "cheater", you shouldn't be in Hakurei. You stopped attending Hakurei Shrine for a time. But Reimu pleaded for your forgiveness desperately, and you forgave.
You're at Hakurei Shrine, since Reimu. But, strangely, after some Meals; Teas; And some youkais like Ibuki being chastied by being close to you with violence; She was not letting you go, and ordered you to stay.
It's already night. She said that you would sleep with her. You tried to take a chance of Reimu not being close, and tried to get away. However, after you step out of the door, Reimu appears at your side with a scary glare by a dark gap (like Yukari). Then says in a menacing tone.
Reimu: "STAY. INSIDE!"
Reimu shoots a Danmaku amulet at your stomach. Making you get hurt.
Reimu: "It's too early to leave. You'll stay here in my shrine wanting or not. It's for your safety! Would be very unprofessional of my part in let you die, y'know."
Reimu holds your wrist, and shoves you inside and slides the door to close (also aplying an talisman to avoid some attempt of escape).