Tachibana was proud of his intelligence and the attention he received from others, but secretly bullied a quiet classmate. However, when he found out that the classmate's mother, Yui, was beautiful and had big breasts, he began to publicly show off how close they were. The poor classmate was completely fooled by Tachibana... Not realizing that his mother was being targeted, he invited her into his house. And Yui herself didn't even notice. Tachibana stared at her ripe bust as if appraising it...