Smile! Vol. 5 by Mitei Hattori

Having joined SHS fully aware of the risks, Yuushi pushes forward, gradually drawing closer to the truth behind the cult. And finally, his actions lead him to witness Megumi, his long-estranged wife, and her mysterious presence within the organization. As Yuushi continues to work undercover, Suzumura and Tsuji, both of whom harbor complicated feelings toward the cult, strengthen their resolve and decide to work together to bring the organization down. However, it's a decision that quickly puts their lives in danger! The determination and actions of those who seek vengeance against the Smiling Hearts Society seem to only stir up further unrest...