Tona-Gura

The Arisaka sisters, Hatsune and Kazuki, and the Kagura siblings, Yuuji and Marie, grow up as next-door neighbors, close enough to climb between their second-floor verandas. They spend their childhood playing together until the Kaguras move away. Ten years later, Yuuji and Marie return to live next door. Yuuji has become a pervert, while Marie is no longer the crybaby she was as a child, leaving the reunited neighbors to meet each other anew.