If you're looking for anime similar to Ie ni Kaeru to Kanojo ga Kanarazu Nanika Shiteimasu (Light Novel), you might like these titles.
From classmates to brother and sister, living under the same roof. After his father’s remarriage, Asamura Yuuta ends up getting a new stepsister, coincidentally the number one beauty of the school year, Ayase Saki. Having learned important values when it comes to man-woman relationships through the previous ones of their parents, they promise each other not to be too close, not to be too opposing, and to merely keep a vague and comfortable distance. Standing on fairly equal ground, these two slowly learn the comfortable sensation of living together. Their relationship slowly evolves from being strangers the more the days pass. Eventually, this could end up in a story about love for all we know.
The protagonist, Naoya, is a first-year in high school. He asks out Saki, a girl he has been in love with, and she agrees to be his girlfriend. He's currently on cloud nine. But then, a beautiful girl named Nagisa comes up to Naoya one day and tells him that she wants to go out with him. Naoya feels himself wavering because Nagisa is such a good girl, and he comes to a decision! A new kind of romcom from a rather unexpected decision is about to begin!
Nao and Uehara are two teens in an unlikely situation -- they've accidentally signed a lease for the same apartment! As time passes, they inevitably became a couple, and share the joys and hardships of living together day by day. Things take a turn for the worse when Nao forgets Uehara's 16th birthday! Can their relationship be saved? Or is this happy couple doomed for failure?
In the series, Ataru Moroboshi's supernatural encounters with the feminine kind all start when he's chosen to play tag with an alien princess named Lum who invades the earth on her UFO. Ataru has ten days to touch Lum's horns or aliens will take over the earth! As it turns out, the game of tag is only the beginning of Ataru's troubles, as he continues to attract strange encounters with otherworldly beings like beautiful snow spirit Oyuki and the sexy crow goblin Princess Kurama!
In a society where high school students are matched with partners for “marriage training,” third-year Jirou Yakuin is assigned to Akari Watanabe, a “gyaru” who couldn’t be more different from him. However, the top ten performers are allowed to switch partners, so the disparate duo play the part of a perfect couple in an attempt to land their respective crushes.
Miyu's parents have big dreams: her mother wants to explore the universe and meet aliens, and her father wants to develop a new space shuttle. In order to accomplish their goals they decide to work at NASA; but due to their inevitably busy schedules, Miyu is sent to live with a friend of the family. On the day she arrives at her new home, her caretaker leaves on a religious pilgrimage, leaving her alone with his son Kanata. To top it off, an alien baby crashes into the house that night! The ship is too damaged to fly so the baby and his pet/baby sitter decide to live with Miyu and Kanata until help arrives, whenever that may be. How can two unrelated middle school kids learn to live together while raising a baby that insists on calling them mom and dad?
Kotoko Aihara has always been in love with Naoki Irie; he’s tall, handsome, and rumored to be the most intelligent student in Japan – who wouldn’t be? Only one thing stands in the way of a relationship with Irie: Kotoko is ditzy and is at the bottom set of her school, and Irie-kun hates nothing more than ditzy, stupid girls. When disaster strikes and Kotoko is forced to move in with Irie-kun’s family, she suddenly sees her chance to bridge the gap. After all, even cool, super-intelligent guys must have a soft spot, right?
Ataru is one of the most desperate womanizers alive, and a man whose life is about to become complicated. When aliens invade, he discovers he has been chosen at random to be mankind’s defender, and must play a game of tag with the beautiful alien princess Lum to decide the fate of the planet! After chasing her with all of his crafty techniques, Ataru finally wins, but his victory also means he must marry the princess herself! Now, with strange alien visitors and a jealous wife to handle, Ataru still manages to keep an eye on his ultimate goal: having his own harem!