さえ

さえ is a particle used to highlight that even something small or seemingly unimportant is enough to achieve a result, or to emphasize an extreme condition. It can be attached to nouns or to the dictionary form of verbs, and is often used with conditional forms like 〜さえあれば or 〜さえ〜ば to say “as long as there is even ~” or “even ~ would be enough.” It adds a nuance of exclusivity or emphasis, often conveying frustration, surprise, or strong emphasis.