Liar, Liar, Vol. 4 by Haruki Kuou
The May Interschool Competition has been thrown into chaos by the Chameleon, a cheater able to impersonate anyone in the Game. Hirotos team has managed to stay in the running, but only barely, and Hiroto himself has been eliminated. However, the lying transfer student claims this was part of his plan. Hes uncovered the secret beneath the Game, and its time for a counterattack. Can he really win a competition hes already lost, though?