Akio Honjou is a high school student with a special gift for music. He can perfectly recall any piece of music that he has heard only once. One day, as he tries to reproduce a particularly soothing piano melody, he unexpectedly meets Juri Makina—the girl whose cell phone had spontaneously played the tune earlier in class. If art is the only way to truly know what landscapes populate others' inner worlds, then can this particular tune pave the way for Akio to begin to understand the more intellectual and emotional aspects of his captivating classmate, Juri?

Masahiro Setagawa is a hopeless teenager who is often used by the neighborhood bullies as an errand boy. Defenseless, Masahiro knows that nobody will ever save him. However, his life drastically changes when he meets Kousuke Ooshiba, a man known as the "Bear Killer," who takes down neighborhood gangs. A year later, Masahiro and his former friend, Kensuke Ooshiba, attend high school, only to find that Kousuke is their math teacher. While the three grow closer, Masahiro starts to view Kousuke as his "hero," and Kousuke develops an urging desire to protect Masahiro. However, their normal lives take a turn when Kensuke's childhood friend, Asaya Hasekura, returns, seeing Kensuke as more than just a friend, much to his surprise. Will the three boys be able to live a regular high school life? Or will forbidden love keep them apart forever?

Umaru Doma is a model student who has a hidden side: when she gets home each day, she puts on her hamster hoodie and turns into a sluggish otaku fond of junk food. As Umaru continues these daily antics, the friendship between her and her classmates—Nana Ebina, Kirie Motoba, and Sylphinford Tachibana—deepens, and more and more interesting events begin to unfold. Of course, these events give rise to numerous questions. What did Nana ask of Umaru's brother Taihei? Who is the mysterious girl with the diamond hairpin? And most important of all: why does this girl seem to know Umaru? These questions and more will be answered in Himouto! Umaru-chan R!

While reminiscing about her journey so far, Aoi Yukimura finds herself eager to go mountaineering once more. A likely opportunity arises when Koharu Senjuin invites Aoi to check out the Mountaineering Club after school. As the head of the club, Koharu speaks enthusiastically of the activities she and the other members partake in, especially as they strive to reach the top in various competitions. Although impressed by the club's dedication to its goals, Aoi feels reluctant to join, preferring to learn and enjoy mountaineering at her own pace. Her experience during this brief visit, however, leaves her wondering why she climbs mountains in the first place. With the support of her friends, Aoi searches for the true motivation behind her hobby, all while continuing to train for the highly anticipated second trip to the summit of Mt. Fuji.