Twice she denied Hina Sugita in the first half, tipping over spectacularly just before the half hour mark and then scrambling at the back post a few minutes later to push a header wide to ensure the teams entered the break scoreless.
Alfeld was finally beaten on the hour when New Zealand half cleared Japan's seventh corner of the match into the path of Hasegawa who rifled home a left-foot drive from the edge of the area. 18 minutes later it was a right-footed strike from the same player this time further out that whistled past Alfeld to put the match out of reach of the young New Zealanders.
Megan Lee conceded a heartbreaking penalty in stoppage time, Alfeld guessed the right way, but Sumida put had enough power on the spot kick.
In the past 18 months Japan has claimed the FIFA Women's World Cup title as well as a silver medal at the recently completed Olympic Games. Throw in a third place finish at the U-20 world cup on home soil last month and their pedigree is obvious.
CJ Bott returned from an ankle injury to captain the Young Football Ferns and restore Temple's first choice back four, but unfortunately they lost influential left back Laura Merrin to a shoulder injury in first half and the news is not good for the defender.
The Young Football Ferns final Group C match is against Brazil on Sunday night (NZ time), with Japan facing Mexico at the same time across town.
FIFA U-17 Women's World Cup Azerbaijan 2012 At 8km Stadium, Baku
New Zealand 0 Japan 3 (Yui HASEGAWA 60', 78'; Risa SUMIDA 90'+3 pen)
Halftime: 0-0