Smile! Vol. 3 by Mitei Hattori

The Smiling Hearts Society continues to mercilessly eliminate all those who go against them, without exception, and with the number of their victims rising, Yuushi quickly falls back into despair at his own naivete. Meanwhile, his old friend, Detective Uozumi, starts to conduct his own personal investigation. Is he yet another individual with deep ties to SHS...? The darkness only grows darker as the dead crop up one after another. What is the disaster that these wicked smiles wish to invite?