SELECT MAX("Run Ratio") FROM table_67843 WHERE "Runs Allowed" < '58' AND "Wins" = '5' AND "Team" = 'japan'
What is the highest run ratio Japan, which has less than 58 runs and 5 wins, have?
CREATE TABLE table_67843 (
    "Rank" real,
    "Team" text,
    "Wins" real,
    "Losses" real,
    "Runs Allowed" real,
    "Run Ratio" real
)