The story of Lesson XX has a sweet feel to it. It revolves around two boys, Shizuka and Sakura who are friends at a coed boarding school. One day, Shizuka happens to notice Sakura’s sheer beauty when he dives in to take a hit from a baseball. After some mixed up thoughts of who Sakura likes, Shizuka tells him he wishes to kiss him as a joke. But Sakura doesn’t care; he still insists that the two kiss under the starry sky. After this incident, Shizuka thinks it’s best for the two to be away from each other, so as to sort out their thoughts and real feelings. (Source: ANN)

Having spent time at a juvenile corrections facility, teenage delinquent Saki Asamiya is given a chance to redeem herself and delay her mother's possible death sentence by working as an undercover cop. Armed with nothing but a special yo-yo, Saki's assignment is to return to her high school and investigate on the corruption and mysterious deaths among the students. But in order to find the answers to the condition of her school, she must confront the wealthy and powerful Mizuchi sisters, who moved in and have taken control after her previous expulsion. (Source: ANN)

Fresh out of college, Kawase Mitsuro is eager to start his new job as a middle school art teacher. Upon his arrival, he quickly blends in with the masses of girls ogling the toned body of senior teacher Kazama Toshiaki. Kazama ignores the schoolgirls. However, Kazama realizes something is different about Kawase and decides to ask the latter out to dinner. Unconvinced his advances are serious, Kawase goes along with Kazama halfheartedly. When Kazama's true feelings are revealed, will Kawase embrace his potential lover or give in to the expectations of society?

Young kendo prodigy Ranmaru Samejima captures the attention of Kei Enjoji, the illegitimate son of a yakuza boss. Kei, determined to form a bond with Ranmaru, cultivates a friendship built on trust and sacrifice, which soon turns into love. After saving Kei from a yakuza hit-and-run attack, Ranmaru is forced to give up kendo forever, and the two are left with only their faith in one another. Vowing to support each other far from the world of the yakuza, the two begin living together as a couple. However, when a mysterious figure from the pair's past returns in pursuit of Ranmaru, they are thrust back into the world they fought so hard to leave—and their love may not be strong enough to survive it.