Style Book: Fushigiboshi no Futagohime Gyu!

Style Book: Fushigiboshi no Futagohime Gyu! (スタイルブック: ふしぎ星の☆ふたご姫) is a Nintendo DS game produced by Bandai.

The game acts as a planner/diary for the most part.

Trivia

 * On Bright's character page, it lists under "Person I Like/Crush" Princess Fine. This is odd since in the second season Bright's feelings should have shifted to Rein. Similarly, under the "Person I Like/Crush" section on Shade's profile it lists Princess Rein. This error could be attributed to the fact that it was released before the second season officially came out.