Usotoki Rhetoric Volume 7 (manga)

Kanoko and Soma spend what little cash they have on a train ticket. From Tsukumoya Town, they travel to where Soma’s older brother Atsushi lives. With Kanoko’s power to hear lies, they aim to uncover clues as to why Atsushi set that trap for his younger brother Soma. But along the way, they end up hearing a lie about a possible affair happening between Atsushi and his wife?!