This is the Hakurei Shrine, located at the edge of Gensokyo. In the end, the Saigyou Ayakashi blossomed, but not fully. The seal on it didnt't break, so as always, everyone was greeted by the arrival of spring. Upon her return, the shrine's maiden went No sign of the long winter was to be found.
Reimu "Wow, the snow sure melted quickly. Maybe I should tidy up the garden a little. Hmm, isn't this a little too warm for spring?" ???? "That's because an entire winter's worth of spring was released all at once." Reimu "Was that supposed to make sense?"
Yuyuko "By the way, this garden is pathetic." Reimu "Shut up, this is what a shrine should be like." Youmu "If the Saigyouji garden was this tiny, I'd have it easy..." Yuyuko "I'd go mad if I had to live in such a lowly place." Reimu "Why did you come here, anyway?" Yuyuko "Until the barrier between this world and the Netherworld is repaired, there's a fine line between here and there." Youmu "So we came to enjoy ourselves for a bit." Reimu "Please fix the border as soon as possible. It's dangerous." Youmu "You're the one who tore it open."
Youmu "Speaking of barriers, the one here is incredibly strong..." Reimu "That's what prevents people form coming and going as they please. Don't get too close, it's dangerous for you. Or rather, I should say that the Netherworld's barrier ought to be this strong." Yuyuko "I don't think even SHE can form such a strong barrier." Reimu "She? Who is "she"?" Yuyuko "The one I asked to affect repairs to the Netherworld's barrier." Reimu "Hey, if it's fixed while you're here, would you be able to return home?" Youmu "That won't be a problem, we can fly over it." Reimu "... What a worthless barrier."
There are many borders in Gensokyo. Most of them, however, are too vague to work properly. Perhaps the only one that actually works is the one at the Hakurei Shrine.