Medium processing apparatus and image forming system

An image forming system, comprising:

• an image forming apparatus configured to form at least one image on at least one medium;
• and
• a medium processing apparatus including,
• a liquid applier configured to apply liquid to a part of the at least one medium on which the at least one image is formed by the image forming apparatus,
• a post-processing device configured to perform processing on a bundle of media, the bundle of media including the at least one medium to which the liquid is applied by the liquid applier,
• a first liquid storage included in the liquid applier, the first liquid storage configured to store the liquid to be applied by the liquid applier,
• a second liquid storage configured to store the liquid to be supplied to the first liquid storage,
• a liquid supplier configured to supply the liquid from the second liquid storage to the first liquid storage, and
• a first liquid detector configured to detect the liquid in the first liquid storage,
• the liquid applier including a liquid absorber, the liquid absorber having a first portion to be partially immersed in the liquid stored in the first liquid storage and a portion configured to contact the at least one medium and apply the liquid, and
• processing circuitry configured to control an operation of the liquid supplier in accordance with a detection result of the first liquid detector.