Secret x Siblings

A high school girl named Rinko enjoys caring for children and often assists at the kindergarten her younger brother attends. On her route home, she passes Tsuga, who appears tough and delinquent-like, and Mogami, a glasses-wearing, aloof individual. Though they seem unrelated, there may be a deeper connection. The story is presented in a 4-panel comic format, possibly involving themes of youth and parenting.