〜以来いらい

以来 marks the time after which something has continued or changed, indicating that the situation has held true from that point onward. It can attach to a noun, to the て-form of a verb (to indicate since performing an action), or to the た-form of a verb (to emphasize since a completed action). Contexts typically involve long-lasting states, changes in habits, or a lasting condition that began in the past.