The 100 Japanese Poems is an application to read poems called tanka in Ogura Hyakunin Issyu aloud with the 4-3-1-5 method which is used for the carta contests.
Carta is an Japanese card game in which players fight over the poem-printed cards. When a poem is read aloud, the player who touches the right card first can take that card. Finally, the person who has largest numbers will be a winner. (There are several other rules.)
To play carta with these 100 poem cards, you need at least 2 things. One is the 100 card set, another is a person who read poems aloud. This application can serve as that reader role. It will be useful when all people there would like to play carta as players or you want to practice carta alone. Its also useful when nobody can read poems correctly. PLEASE NOTE THAT YOU CANT PLAY CARTA WITHOUT THE REAL CARDS.
You can also enjoy this application for learning. For this purpose you dont need real cards. You can enjoy watching cards with Japanese, seeing the meaning in English of each poem and listening the reading.