The only thing that kept me going was the mass amount of pouting she was doing.
Feel free to point out any errors and areas for improvement.
All rights belong to Hibiki.
Explanations:
2nd game – Basically, the 4 prefectures listed have the names of the animal in them. For example, 熊本 (Kumamoto) has 熊 (Kuma/bear) etc.
3rd game – The katakana listed in the question are the first characters in the katakana form of spade, heart, club and diamonds.
5th game – Dawn written in hiragana is よあけ. So just look for these characters and highlight the character before them to obtain the hidden message.
Watch the original here: