Wakasa begins living in Tatsumi's bathtub. Just having a merman live in his home is difficult enough, but another major problem arises: the living expenses including water for Wakasa!
things that are a little expensive 
seem a little bit cheaper.
بدتِ الأشياء المكلفة قليلاً أرخص بعض الشيء‏.‏
kommen einem die weniger
teuren Dinge gleich billiger vor.
un objet juste un peu cher
n’a pas l’air cher.
coisas que não são caras 
ficam parecendo baratas.