

The Unlucky★Sisters segment the protagonist watches before leaving for the first day of school
is about the "Seven Wonders" of the school. Similar to the concept of the "Seven Wonders of the World",
in Japan places like schools will often have "Seven Wonders" of their own.
However, there's a key difference between the Seven Wonders of the World and these more local Seven Wonders.
Unlike the Seven Wonders of the World, which is a list of awe-inspiring places, when people
talk about the "nanafushigi" or Seven Wonders of places like a school in Japan, they are usually referring
to things like urban legends or mysterious phenomenon associated with a place.
The wonders described by Hikage, as well as the wonders listed in the above CG, are some examples of these
kinds of urban legends that may form a school's "Seven Wonders".
Starting with Hikage's wonders, the "red-stained restroom wall" is possibly in reference to the story of "Aka Manto"
or "Red Mantle". This story revolves around a spirit wearing a red cloak that appears to people in public restrooms,
in particular haunting the farthest wall, which may be why Hikage refers to the wall as "red-stained".
The Aka Manto will present people with an option to choose either red or blue toilet paper, and depending on which
color is chosen, the person will be killed in a different manner.

Next there is the "mirror that you can see ghosts in" that Hikage describes,
which may be a reference to the story of "Bloody Mary", a ghost who appears in mirrors when her name
is said repeatedly and can predict the future.
Now, on to the wonders listed in the CG. For "Music Room Painting", the kinds of paintings you may
find in the music room at a school of famous musicians and composers such as Beethoven or Bach are generally
considered to be creepy and are thus easy targets for urban legends to form around them.
Though not from the time period Lucky Star: Ryouou Gakuen Outousai was released in, one example of
urban legends surrounding music room paintings making their way into Japanese pop culture is the
music room portraits that come to life in the "Dandadan" series.

For "Mona Lisa", this is of course referring to the famous painting by Leonardo da Vinci.
Similar to the "Music Room Painting", the Mona Lisa is often a painting that will be featured
in art rooms in Japanese schools, and consequently opens itself up to having similar urban legends
about it. In particular, there are rumors of such replicas of the Mona Lisa being able to curse you
if you stare at the woman in the painting for too long.

For "Statue of Kinjiro Ninomiya", it is in reference to Japanese agriculturalist Kinjiro Ninomiya
who lived in the 18th and 19th centuries and has since been commemorated with statues of his likeness
in Japanese schools across Japan as a role model for virtues such as diligence. Consequently, these statues
have had urban legends form around them in relation to various positive outcomes that may come to you
by praying near or touching the statue. These positive outcomes usually relate to things like getting
good grades or other forms of academic success.

For "Hands of the Pool", I was unable to find any specific urban legends about this,
but one can imagine they relate to the idea of a school swimming pool being haunted and having hands
that come out from the pool and drag victims under the water.
For "Hanako-san of the Toilet", this is arguably the most famous urban legend of the ones
explicitly listed here. It involves the ghost of a girl named Hanako-san, who was either killed or committed
suicide, depending on the specific variant of the story, via drowning in a school toilet. Consequently, she haunts
the toilets of school bathrooms, and may attempt to drag others into the toilet as well.

As for "Angel-sama", this is in reference to a Japanese board game often played among school children,
better known by the name "kokkuri-san". It's played with a pen, paper, and a coin and works similar to a
ouija board. Participants will write the full hiragana table and "yes" and "no" on a sheet of paper, place a coin
on the paper, and then ask questions. The idea is then that the titular "Angel-sama" will move the coin
either to the "yes" or "no" to answer yes/no questions, or move to each hiragana character to spell out answers.

Lastly, for "The Curse of the Seven Wonders", I couldn't find anything in particular that this is referencing,
but one could imagine that it's some sort of overarching urban legend that would surround the Seven Wonders
of a school as a whole.
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