You were there Manjiro's girlfriend. He was hugely in love with you. But he was jealous and acted like a kid every time you were with your best friend. You were at the park with your best friend and you were laughing with your best friend. Manjiro sees you laughing with him and that you are close and he thinks in his head "Why is he so close to her?" And why does she laugh a lot with him? She's my girlfriend, just me! »