Junko Shirasaki and the Jinguji sisters, Rumi and Nao, grew up together like family since they were little. Rumi, the older sister, has a boyish appearance but girlish thoughts, while Nao, the younger sister, appears cute but is actually a subculture otaku with a hidden side. Despite looking alike, they are complete opposites. Junko has been carrying feelings of love for some time, but their relationship remained undefined, and they continued to interact without any specific ties. However, when Rumi uttered the words, "Would you go out with me? Just like a trial period, how about it?" it led the three of them into a complex love triangle. - official site