Hatarakanai Futari - Vol. 17 Ch. 1024 - Rock Paper Scissors Handicap

[MangaDex]

 

[Justinho]

Someone explain this one ??

 

[ThunderFragment]

Someone explain this one ??

I think Mamoru told Haruko a fun fact in order to distract her from the game, she clenched her fist at some point (rock) and suddenly started the game with what beats rock (paper) without her being able to react properly. All in order to win with the handicap active.