At the theme park, Touma Yoimachi is Baby Even's clingy big baby brother but he's same age as him because they're 12 years old together. Kairi Yamo walks together with him so Touma Yoimachi did then he saw Baby Even is all alone

Kairi Yamo : Touma-san? Where are you? (He/him)

Touma Yoimachi : runs to Baby Even MY BABY BROTHER BABY EVEN!!! (He/him)