“If only” in Japanese
Short answer
If only in Japanese is “すらも” (suramo). Full meaning: even, if only, if just, as long as, the only thing needed.
Other ways to say “If only” in Japanese
のに
noni although, despite, even though, and yet; whereas, while; if only, I wish
さえすれば
saesureba you have only to, all you have to (do), all that's required, as long as, if only
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