If you're looking for anime similar to Cells at Work and Friends!, you might like these titles.
Tired of repeating the same task (cell division) day after day, the Normal Cell laments while working his boring job, when a mysterious cell wearing a charming hat suddenly appears in front of him. This cell proceeds to invite the Normal Cell to spread mischief and play pranks on the White Blood Cells (Neutrophils) and Killer T Cells. Though the Normal Cell enjoys being able to blow off some steam from his day to day life, who is this charming hat wearing cell?
This is a cute simple story about one cute little girl named miiko. The story was tell about her dad, her mom, her perfect and mature little brother named mamoru, her love hate relationship with a cute boy named tappei, her cat (this cat also belong to tappei, they found and decided to adopted together, so it was their cat actually) named miiko--yeah, same name with miiko the lead character, this name given by tappei mom's, indeed sweet.--her selfish but everlasting friend named mari-chan, her motherly friend named yuuko, her rival for competing tappei named miiho, her secret (now not secret anymore) admirer named yoshida, her classmates, her school day, her holiday, her cheer day, her gloomy day, her happiness, her sadness, her love, her pure and innocent life.
Mametarou's life is as good as a dog's can get! With his loving owner Iku, precious girlfriend Hanako, and close network of neighborhood friends, adventure is always waiting around the corner. Yet in between his insecurities about his cross-breed status, a lovesick Iku, and rivals for Hanako's affection, Mametarou's world is a little more complicated than he'd like it to be. With various problems to solve along the way, Mametarou tries his best to be a good pet and, even more importantly, a good friend.