If you're looking for anime similar to Mamonogatari: Itoshi no Betty, you might like these titles.
In a world of anthropomorphic animals, Belle Lablac was born as the only human being. Having no fangs, fur, or scales, she was called "Faceless," and she lived a lonely life with no one else she could identify with. "I want to be part of the world..." With such longing in her heart, she decides to set out on a journey to find her roots, carrying the Runding, a great sword as tall as she is. She doesn’t know how many adversities await her along the way...
Cecily Cambell just wants to be a Knight and protect her home like her father and grandfather before her. There's just one problem: she’s incompetent! During a fight with a crazed swordsman, Cecily’s cherished blade breaks; and just as she’s about to be cut down, a man named Luke comes to her rescue wielding a katana - a blade unlike any Cecily has seen before. Together they must ensure that the Demon Sword Aria doesn’t fall into the wrong hands, and Cecily alone must prove herself worthy of her very own katana.
A beautiful girl named Guri, who has a mysterious item that forces two random people to kiss and turns them into couples, appears in front high school student, Aino Seiji. Despite being dressed up as a shinigami, she's actually cupid. Suddenly, Guri tries to kiss Seiji, and then... Unavoidable and uncontrollable. A forceful love comedy that starts with an angel and a kiss!!
Yuuhi Amamiya is a loner whose mistrust of people was instilled in him at a young age by his abusive grandfather. So when an annoying talking lizard tells the university student that he is one of twelve knights chosen to stop the gigantic "biscuit hammer" before it smashes the Earth to smithereens, Yuuhi has no inclination to rescue such an unkind world. Despite his apathy, the boy is targeted by a golem while going about his day-to-day life, and ends up teaming up with the other knights anyway. One of his new companions is Samidare Asahina, the "princess" and leader of the knights, who secretly is only trying to protect the Earth so she can destroy it herself! Entranced, Yuuhi swears eternal loyalty to this cheerful devil that promises to crush the world he despises.
Follows Kaito Takagi, a high school student with a mob character and low status. He's an ordinary explorer who hunts slime everyday in dungeons that appear in Japan. One day, he encounters a golden slime that he has never seen before. Baffled, he still manages to defeat the slime, and get an extremely rare item called the "servant card," which can summon mythical beings, and has a value of hundreds of millions. Once he is decided, he is also able to summon Valkyrie, a beautiful warrior maiden. Kaito starts his adventure to rise from being a mob to a hero.
All Kobeni wanted for her sixteenth birthday was to enjoy a cake with her family, but her mother surprised her with a piece of unwelcome news instead! The teen’s late grandfather arranged a marriage for the girl, and her 'fiancé' Hakuya, along with his mature-for-her-years little sister, are moving into the house today! Now, Kobeni and her pervy older sister Benio must adjust to their new extended family life, from figuring out what foods the newcomers dislike, to explaining to their friends who these new relatives are!
Inari is a sweet and shy middle school girl with a HUGE crush on Tanbabashi, one of the cutest guys in her grade. She’s not smooth enough to tell him how she feels, and every time she tries things just keep getting worse! But when a beautiful goddess grants Inari the power to shape-shift, Inari uses her newfound powers to attempt to win over Tanbabashi.