Those Not-So-Sweet Boys, Volume 3 (Those Not-So-Sweet Boys #9-12)

Now that Rei and Yukinojo know about Chihiro's crush on Midori, plans commence to make his love come true. Yukinojo invites Midori to a study session, where she finds herself at the Goshima estate. There, she meets Chihiro's younger siblings and learns more about who he really is. However, there's someone who isn't all too happy to see Midori and Chihiro grow closer by the minute...