Few Social Links in the game can be done at night, but the Tower Social Link is one of them. The Unusual Monk Mutatsu is always drinking alone at Club Escapade, but you might forge an unexpected bond with him if you get close enough.
Persona 3 Reload Tower Social Link Guide (P3R)
To start Tower Social Link, you must first reach Rank 4 in the Strength Social Link, then speak with Yuko once (no need to spend time with her) so she can tell you about Mutatsu. Visit Club Escapade at night, and you’ll find him upstairs. You need Courage Level 4 (Tough) to be able to speak with him.
