At the June 20 Yoyogi event, during the Die Zero Time segment, Mashima faced fellow NEO GENESIS member Seira Mei in a singles match. Although she lost, after the match, High Speed Champion Mizumori praised her performance and even challenged her to a future match
Facing Mizumori as the starting pitcher, Mashima engaged in a speedy exchange of blows, throwing elbows with relentless force
Natsupoi was hit with four consecutive dropkicks, and then, with an assist from AZM, she delivered a swan dive flying body attack. Towards the end, she came very close to pinning Natsupoi with a roll-up technique, but in the end, she gave up the three count to Fairial Gift
Backstage after the match, Mizumori asked, "You have a lot of potential. Poi-san made the final move, what did you think?" Natsupoi replied, "No, Emma was good. She was really good. There were some really close calls."
On the other hand, Mashima bit her lip and said, "Ah, it all hurts. Today, the other three besides Emma were all people who had previously won the High Speed Championship, so I was at their mercy to some extent, but I can't lose to them, and as someone who wants to challenge the High Speed Championship and is aiming for it, I really wish I could have shown more speed and skill today. I'm reflecting on that."
Then, the high-spirited Mizumori appeared and gave Emma a pep talk, saying, "Cheer up! Today's loss was a valuable one. Take it one step at a time. You have good potential, so let's grow step by step. It's going to be okay, if you believe in yourself, everything will be alright. I'll be patiently waiting for you to grow, Emma."
Then Shimajima retorted, "I'm serious about taking on the challenge of high speed. I lost today, but I'm not discouraged at all, and you can only talk down to me like that for now, Yunamon."
Sensing the passionate feelings of Mashima, Mizumori seemed unable to contain her excitement, saying, "Those eyes are great, aren't they?"

