This issue is about changes in sake aroma.

Sake aroma is mellow when first poured, but changes over time. For example, the gradually released aroma of flowers and fruits increases the complexity of the sake aroma, ultimately dissipating into a faint, spicy aroma.

Sake aroma changes over time in the following 3 phases:
1. First Aroma Note: Sake aroma first generated when the nose is close to the glass.

2. Second aroma generated from air mixing into the sake. This aroma is detected when fragrance components react to the oxygen in the air.

3. Lingering Aroma: Aroma generated from a small amount of sake remaining in the glass after the sake is consumed.

Changes to the sake aroma that occur while consuming sake are thought to be generated from the sake aroma mixing with air, changes in temperature, difference in aroma components, etc.
Sake flavors are largely divided into four major factors - sweetness, bitterness, sourness and umami flavor – and also by various factors.
Sake aroma can be expressed and enjoyed in unlimited ways. Sake flavor is sweet in addition to bitter when first tasted. Also, the temperature, the initial aroma when first tasted and balance are also important factors.
Why not try expressing the various flavors in your own words? Organizing the complex qualities of sake flavors difficult to grasp could reveal new ways to savor various sake.