What cartoon is this?

Bingo game

The characters in the painting are Oreki Houtarou and Chitanda Eru.

Brief introduction to the story

Bingguo is a juvenile reasoning work. Among other high school students who are about to start their "Rose" high school life, Oreki Houtarou, the hero of this drama, is a "gray" energy saver, that is, he doesn't do anything unnecessary because he doesn't want to regret it. It doesn't matter if someone says he is alienated and world-weary, because this is his style. In this way, he entered the "Ancient Books Research Association" on the verge of abolition because of his sister's order. Although he finally recruited four new members, he was involved in the mystery that the president suddenly dropped out of school 33 years ago. The president left a social magazine called Bingguo, but what was the tearful message hidden in it? ...