1. INTRODUCTION  
2. DATA, SAMPLE SELECTION, AND METHOD  
2.1. HSC Galaxy Sample  
2.2. CAMIRA Groups/Clusters  
2.3. Photo $z$ catalog and stellar mass estimation  
3. RESULTS AND DISCUSSION  
3.1. sSFR Distribution  
3.3. Revisiting Green Valley Fraction  
3.4. Systematic Effects  
4. CONCLUSIONS