Tetra knows all the hiragana by the time she returns

Tetra goes to the Tokyo Skytree observation deck

Tetra encounters and purchases onimai merch

Tetra looks out a window from the top of >=5 of the buildings in "List of tallest structures in Tokyo" wikipedia article

Tetra looks out a window from the top of >=10 of the buildings in "List of tallest structures in Tokyo" wikipedia article

Tetra looks out a window from the top of >=3 of the buildings in "List of tallest structures in Tokyo" wikipedia article

Tetra goes to a place that is both a tea shop and a disco

Tetra meets a member of the National Diet

Tetra visits the Tokyo Imperial Palace (e.g. guided tour)

Tetra goes all the way around the Yamanote line 

Tetra knows all the katakana by the time she returns

Tetra completes the tutorial (visits 4 shrines before leaving Tokyo)

Tetra can construct sentences including each of the 80 first grade kyōiku kanji by the time she returns

Tetra sees a chess set where the chess pieces are buildings in Tokyo

Tetra encounters an image of Tsuruno Yui from Magia Record 

Tetra encounters an image of Kumi Seika from Magia Record

If tetra goes to Roppongi, something bad happens to her 

Tetra buys a product with Hatsune Miku on it

Tetra/Sophie visit Shinjuku Gyoen National Garden

Tetra visits the Toyota Commemorative Museum of Industry and Technology 

Tetra visits the Nagoya City Science Museum