The code left by Jiraya was meant to be a hint from one of his books and the very first letters of their page numbers. Well the no. 9
The number "9" isn't actually a nonumber. It's a Katakana letter タ from the Japanese language 'Katakana' that reads as "ta" or タ in japanese. By, by which he meant his book's name 'make out'Make Out taTactics 'ctics'. By 31
By "31,8 8", Jiraya meant the 8th word ofon page 31 page no.
By 106"106,7 7", he meant the 7th word of 107on page no106.
By 207"207,15 15", he meant the 15th word ofon page 207 page no.
And all these words read: " THE"THE - REAL- ONE'S -NOT -AMONG-THEM".