If you liked the Welcome to the NHK! anime, the Anime-Planet community thinks you'd like:
Long ago, young Meiko Honma tragically died and her tight-knit group of friends, shaken by the event, drifted apart. Now, ten years later, Meiko has re-appeared as a ghost that only Jinta, the former leader of the gang and an avid shut-in, can see. All she desires is for Jinta to fulfill her final wish so that she can move on to the afterlife, but with no memory of what it was, it’s up to the teenager to gather his former friends and discover what will allow his beloved friend to rest in peace. With so many feelings left unsaid, can this group work out their strife and help the ghost of the girl they once adored?
A hikikomori with some psycho/talking furniture problems and a cute girl trying to cure him of it. I find that it's style resembles the one used in Ano Hi Mita Hana no Namae o Boku-tachi wa Mada Shiranai (Anohana).
Holding strictly to his family's creed, Kou Ichinomiya has never once, in his life of privilege, owed anything to anyone – that is, until a self-proclaimed Venusian named Nino saves him from drowning in the wake of a dire accident involving Kou's pants. Eternally indebted to the supposed extraterrestrial, Kou moves into her little community under the bridge along the Arakawa river. Ripped from his life of luxury and success, the young Tokyo U graduate now must adjust to his well-appointed hovel, strange new neighbors, and peculiar lover, Nino.
If you liked Arakawa's weird yet enjoyable characters then you would like to watch Welcome to the NHK! (or vice versa) because both series have some cracked and unique characters who are living isolated from the society. Everything they do is extreme yet you get used to it while wathing these series.
Karada is an elementary school student who acts mature for her age, and asks that people treat her like an adult. While praying at a wishing stone (negai ishi), she meets an older girl named Shouko. Shouko had moved to this small town to start a new life, but the same day she meets Karada, she encounters her brother, Hiro. Tension builds as Shouko and Hiro reflect on their past relationship while sending Karada home alone, and by the end of the day, both Shouko and Karada end up at the wishing stone hoping for change. Karada wishes to become an adult, while Shouko wishes for things to go back as they were in the past. That night under the bright moon, the wishing stone grants their wish, and an unbelievable transformation occurs: Shouko becomes a child and Karada becomes an adult. Now the two girls must struggle with their new bodies while finding a way to return back to what they once were.
Asatte no Houkou and Welcome to the NHK are two anime that serve as prime examples of strong character development. They each focus in on a core set of characters as they try to cope with their flaws and search to find their place. Although NHK's harsh social commentary gives it a very different feel compared to the lighter tone of Asatte, they're similar enough at their core so that fans of one should be fans of both.
Moritaka Mashiro feels as if life is passing him by; with no dreams or motivation, he trudges through day-to-day life. One day, after leaving his notebook behind, he returns to school and finds the smartest guy in class, Takagi, waiting for him. Takagi is happy to return the book, but on the condition that Mashiro agrees to become a mangaka with him. Though Mashiro initially declines, he soon reconsiders when he discovers that the girl he likes, Azuki, dreams of becoming a voice actress. And after promising that she can have the lead role if their manga is ever adapted into an anime, he suggests that they get married once they are both successful! Shockingly, she agrees to the proposal and Mashiro and Takagi embark on their quest to become manga artists.
Fifteen-year-old Yamada has just entered high school and is gung ho about achieving her ultimate goal: to have one hundred sex partners! There’s just one problem: she’s a virgin, and she hasn’t even had a boyfriend! To get the ball rolling, Yamada decides to target a shy boy named Takashi from her school; but even though he is also a virgin and she ruthlessly aggressive with her feminine ways, it’s not as easy as Yamada hopes. Though they begin to have feelings for each other, will Yamada and Takashi ever get past first base?
Both anime, NHK and B Gata, have a main plot dealing with a certain subject, but sort of an underlying social aspect regarding young male-female interaction, and the plight of a young undersexed boy/girl coming to understand their emotions.
While not dealing with the same core subjects, I believe there is quite a bit of core intrest overlap between the series'.