[Machine Translation] A promise to a friend makes you strong! A tale of friendship of the strongest tank! Rude and his friends confront Vasago in the Royal Library Labyrinth. Vasago, who has taken Grato's half-body into his own, has gained power over the Ludes in both melee and magic. In the midst of the fierce battle, Vasago senses Grato's magical power remaining inside him and decides to call out to him. Rude and Grato are friends, even if they are half of the enemy. Can Rude and Grato laugh together again as friends? With 9999 hides, powerful skills, and promises to friends, this is the ninth volume of the adventures of Rude, the strongest tank in the game!