Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_18254488_2 (league_cup INTEGER, player VARCHAR)

### Question ###
When koki mizuno is the player what is the lowest league cup?

### Accurate SQL ###

SELECT MIN(league_cup) FROM table_18254488_2 WHERE player = "Koki Mizuno"