Masa-kun (This is a Japanese honorific suffix, often used for young men.)

Masa-kun and his younger brother Hamaura are the kokeshi dolls who make Amaya jump rope to get a key; he must jump 100 times with someone else to obtain it. However, he jumps 7000 times alone, so Hamaura gets angry and increases his speed to the maximum. This causes Masa-kun's hand, which was used as a rope, to break off. Calm, level-headed, likes to take care of Hamaura 🥰 Hamaura literally gets angry about everything and has a hard time managing her anger.