If you're looking for manga similar to Isuca: Gokuraku, you might like these titles.
Fuuka Esumi is definitely not an ordinary fifth-grader: with the height of 163.5 cm, weighs 50 kg, and a body figure of an adult female, she sure causes a lot of misunderstanding and embarressments.
Himeko (17), doesn't want anything to do with her family's old bathhouse business. Not until a mysterious transfer student Akemi Yufuin dragged her along into the world of bathing. Follow them for a crazy, fun, and pleasant bath life.
There are three sisters in the Mikumagawa family: calm, relaxed college student Manaka, the quite rough-spoken (?) high-schooler Rinka, and the youngest Yuuka, a smart young girl who can recite the succession of shoguns in the bath. With a family like this, every day is a little adventure!
Ageki Kyousuke, a fat guy with a big appetite, has always been interested in Mitsukura Itsuha, a girl who doesn't stand out in his class. He comes across her alone on the rooftop after school, exposing her erotic body in an extreme swimsuit! Kyousuke finds out Itsuha's secret, which is too unexpected to be ......!
Yoshizawa's friends, Itou, Kitahara, and Nishida often stop by and together they run into 'adult'-level problems. Like her need for advice on drawing realistic penises in her manga, since she's never encountered one in real life before. Or the day when her friends drop by while Yoshizawa's hungover in bed, and she suddenly realizes that she doesn't have on any underwear under the covers. There are a lot of quirky things that can happen in a college girl's home!
Shinjirou's brother is a brilliant scientist whose chosen career is making weird cell phones. Shinjirou has received a gift of his brother's latest product, the Doll-Phone, which is a walking, talking, tiny girl who doubles as a cell phone. But he can't help feeling that a phone like that seems kind of perverted to use...