Mens Chika Idol wa Kakoku Sugiru

Sakuma Ranmaru, an underground idol known as "Ran," keeps going despite others quitting, encouraged by his manager, Poma-chan. One day, feeling down about his expressions during a photo shoot, Poma-chan suggests a way to help him relax, but...? (Source: Kadokawa, translated) *Note: Includes 1 extra chapter.*