Tona-Gura!

Vol.3 Chapter 18 : Bikinis Are Relationship-Healing Magic
Vol.3 Chapter 17 : An Exciting Summer
Vol.3 Chapter 19 : A Test Of Love At A Test Of Courage
Vol.3 Chapter 17 : An Exciting Summer
Vol.3 Chapter 19 : A Test Of Love At A Test Of Courage
The Arisaka sisters (Hatsune and Kazuki) and the Kagura siblings (Yuuji and Marie) lived next door when they were smaller. So close that they could climb onto each other's verandas from the 2nd floor. They would always play together until one day the Kagura siblings had to move. It's been 10 years and the Kagura siblings are moving back! Yuuji's turned into a pervert and Marie isn't the crybaby she used to be?! -- Manga Updates