Merman in My Tub volume 1 by Itokichi
I gave this book ★ ★ ★ ★ ☆ 4 stars, I liked it a lot.
What happens when a merman moves into your bath tub? Serious, studious Tatsumi is about to find out. One day he rescues someone by the river and takes him home to help him only to realize that he didn't rescue a human, but a merman.
Wakasa is a very energetic merman who had to leave his home after tourists started flocking in trying to catch a glimpse of him. Tatsumi rescued him from a dirty, trash filled river and now he is living in Tatsumi's bath tub.
This manga is very silly and fun. It follows the day to day life of Wakasa the merman and Tatsumi the student as they learn to live together. Wakasa has many strange friends who come over and complicate things. Tatsumi has to try to keep Wakasa a secret from his family and friends.
I enjoyed this manga a lot. It isn't very serious or very deep. It is a light, fun read that just makes you laugh. Wakasa and Tatsumi are such extreme opposites, their daily interactions are frequently full of misunderstanding. When you add in Wakasa's eccentric friends and Tatsumi's overprotective sister and friends and you have a real recipe for disaster.
If you are looking for a light story that will make you laugh I highly recommend this series.