If you're looking for manga similar to Bikini Warriors OVA, you might like these titles.
Use Slime as an exercise ball! A treasure chest as a stair-stepper! Low-calorie herbs as snacks! Powerful weapons, phenomenal magic, and fierce monsters! The beautiful priestess Alicia will try anything and everything in her struggle to lose weight! Cuz before she can defeat the Demon King, she’s gotta defeat this accursed blubber!
The manga's story centers on Chinpy, a boy who aspires to take up after Luffy, the protagonist of Eiichiro Oda's One Piece manga. Like Luffy, he is able to elongate "a certain part" of his body to fight.
Yamato is a manga/anime crazed guy and actually believes in them. His classmates know better than to argue or be near him because he gets extremely violent and it's up to his friend to keep him from going over the line.
Akabane accidentally discovers that his classmate Sumomo is one of the Japafive Rangers. He is then recruited as one of the Japafive Rangers but things don't go very smoothly.
Eliza is a girl with many suitors – though her disturbingly-muscular grandmother always seems to stand in their way. However, one day, a boy named Wolf crosses her path. He’s interested in her too, but will he be able to get past the barriers that stand before his would-be love interest?
Dick Saucer is a famous pop star and dragon slayer who is admired by many girls throughout the land. Among his biggest fans is Mink, a typical teenager - if it weren't for the fact that she is half human and half dragon! In order to win the heart of her idol (and avoid being killed by him), Mink sets off in search of the legendary 'Pido Potion', which would be able to turn her into a full human. But the going isn't easy thanks to her many enemies, including Princess Vina, who is both president of the Dick Saucer fan club, and Mink's rival for the man's affections.