Haruyoshi, a poor student, was living his ordinary peaceful days until Yuusei and Shuusei, a pair of high-specs twins appeared in front of him. The twins gradually invade Haruyoshi's mind and give Haruyoshi- who at the time was living alone - a place to stay.

"Let's just love each other, just the three of us."

Note: Includes the one-shot "Ijiwaru na Kyoushitsu".