If My Wife Became An Elementary School Student Vol. 3

Ever since losing his wife Takae 10 years ago, Keisuke Niijima and his only daughter Mai have been in a state of despair. One day, however, an elementary school girl named Marika Shiraishi comes to their home with a bold claim – that she’s the reincarnation of Takae! Thus begins their new, unexpected life together as a family!
In Vol. 3, the Niijima family are trying to reclaim their happy days as a family again, but what will happen when Keisuke’s female coworker who has a crush on him confesses to Marika, without knowing that she’s actually his wife Takae, that she wants to marry him?!
Notice: This book is written in Japanese.