Close to the lake, there are times when the temperature lowers drastically even in summer.

A fairy you are likely to encounter at such times is this ice fairy.

Among the fairies around the lake she has a leader-like presence, and is stronger than the other fairies.

She belongs to the more belligerent variety of fairies, and so it is necessary to be careful.

She is quite short and dressed in blue with wings of ice.

She has the ability to manipulate the cold.

Being able freeze small objects instantly, she is a bit more dangerous than regular fairies.

She emits cold air constantly, so her vicinity is always chilly.

Since where she lives is totally unknown, there is no way of telling how she spends her everyday life.

Not just Cirno's, but all fairies' homes blend into nature, preventing them from being seen by humans.

"I saw her freezing a part of the Misty Lake's surface and sleeping defenselessly(*1) on the ice." (Hikozaemon)

"I saw her sleeping sloppily(*2) next to the lake. The surrounding flowers were frozen." (Anonymous)

Since there are many other sightings near the Misty Lake as well, it is presumed that is where her home is located.

It is possible that she has a house in underwater.

"I saw frozen frogs in the rice fields. I think this is the work of fairies." (Anonymous)

An ominous prank. There's little direct harm, but still...

"When I pulled in some fish from the Misty Lake, it was already frozen. That was a real surprise, but the fish kept a long time, and was delicious." (Angler with a big appetite)

And here I thought that no humans fished at the Misty Lake...

There is the danger of other youkai appearing in that area, so inexperienced people would do best in not copying this example.

1: Really defenselessly.

2: Really sloppily.

If it suddenly gets cold, there is a possibility that the ice fairy is nearby.

At such times you should be obedient and flee, or look for the shape of the fairy.

Fairies usually do nothing and keep their distance when they understand that they are noticed.

Since Cirno is easily noticed, I assume that as long as one is not very careless there is little risk of being injured.

Still, if you are to pass through place where she seems to be around, what's the best way of doing it?

She's weak against fire from torches and other objects too hot to touch.

If you're holding a torch to start with she probably won't go near.

Since she can freeze things she touches instantly, refrain from touching her even if she is asleep.

There is a risk of frostbite.

If by any chance Cirno should attack, just start to talk calmly about anything, and when she shows interest it is a good time to ask her a riddle.

When you do that, she will start to think of the answer, and that is a good opportunity to escape.

No matter how simple the question, she can certainly not answer it.