Zutto Seishun Poi desu yo

Yamada, a high school senior, is the president and only member of the Idol Research Club. But he has a feelings that things are about to change... because two new members have joined the club! "Yes! We will have an exciting, sparkling high school life, just like the baseball club!" The club, now consisting of three idol-otaku Yamada, Kouno, and Sugimori, will set out on its goal of producing an idol concert, in time for the school cultural festival! (Source: Comic Days, translated)