Cellphone Girl Heavenケータイ少女子 Ｈｅａｖｅｎ ; ケータイ少女子Ｈｅａｖｅｎ ; ケータイ少女子Heaven

Ginta's father works at a cellphone company called "Choto Bank." Their new cellphone is a humanoid cellphone. Gina's father sent his son a prototype version of the humanoid cellphone, but Ginta's sister unexpectedly made some "changes" to the new cellphone and due to that it makes countless mistakes. What will Ginta do with these new troubles in his life? (First chapters read from left to right)