Liar Liar: Usotsuki Tenkousei wa Ikasama Cheat chan to Game wo Seisuru sou desu

A school the size of an island hosts students competing for rankings. Hiroto Shinohara gained entry by scoring highest on a national exam and quickly rose to the Seven Star rank after defeating the previous year’s champion on his first day. However, this success was based on a mistake, and he must now find a way to keep his position despite the error.