If you're looking for anime similar to Welcome to the NHK!, you might like these titles. All recommendations are made by Anime-Planet users like you!
If life teaches us anything, it is that love sometimes happens in the most unlikely of places, with the most unlikely of people. Koshiro is a run-of-the-mill salaryman who has recently been dumped by his partner. With his heart broken and hope lost, he soon comes to realize that he can love again, once he sets eyes on a beautiful young schoolgirl riding the train. However, there is one catch -- this girl named Nanoka is his sister, who he has not seen in years. Knowing that their forbidden love will always be scrutinized by society; will Koushirou and Nanoka be able to resist the temptation?
Though quite different plotwise, these two anime in my opinion give out the same atmosphere. Despite the fact that you will find none of NHK's comedy in Koi Kaze and there is no theme of forbidden love in NHK, both these shows deal with characters whose troubles are kinda out of the ordinary and they both get very dramatic at times.
Tohru Honda is a compassionate girl who is down on her luck. Her mother having recently died, she has been forced to camp out in the woods for shelter. However, things start to turn around once she is invited to live with class hunk Yuki Sohma and his family... but all is not as it seems! Yuki's family is burdened with a dark curse which causes them to turn into the animals of the Chinese zodiac once hugged by a member of the opposite sex... and Honda may be the only one who can help them.
Hana is a 19-year-old student who falls in a fairy-tale like love with a "wolf man". Over the course of the 13-year story Hana gives birth to two children—older sister Yuki, and younger brother Ame. At first the family quietly lives in city trying to hide their wolf heritage, but when the wolf man suddenly dies Hana makes the decision to move to a rural town, far from their previous city life.
Summer break is now over; the second semester has started for Tomoya, Nagisa and the others, and little has changed. Since Tomoya's relationship with his father is still troubled, he continues to live with Nagisa and her family, even if it means getting roped into organizing a baseball team for the family bakery. Life at school continues as normal with Sunohara as carefree as ever; however, when his sister Mei voices her concerns about him, the series of events that follow place a strain on Sunohara and Tomoya’s friendship. Whether it's saving a person from themselves or passing on a message from the past, one thing’s for sure: no matter how tough things get, good friends will always be there to help out.
While from the outside it might look like Clannad: AS and Welcome to the NHK! don't have much in common aside from shared genre traits, I think both animes do go well with eachother; both are very emotionally charged animes with some times of comic relief. Both animes have a very strong story that covers a lot of serious and often times relatable themes that aren't always cheery. Where Clannad and the After Story cover the love intrest in more of a open way that HNK, and NHK deals a lot with social issues like anxiety, I'm sure whether your new to this kind of anime or a seasoned Romance/Drama buff, if you enjoyed one you'll enjoy the other!