Ikuto was raised by his father, having lost his mother at a young age. He attends a technical school to become a nursery school teacher, and started working part-time at a nursery school as part of his training. There he met the older Nozomi, who he admired after feeling maternal charms which he had not felt before.
One day, his father told him that he was going to marry again and it was going to be with Nozomi! At first he was overwhelmed with the sudden news, but he was happy that the one who he looked up to will become his stepmother.
On the day that Nozomi was to move in with them, his father got news that the long-term insect research study deep in the Amazon that he had been eager to go to for quite some time had finally been approved. She supported him on his work, so she readily agreed to stay behind. So, Ikuto was left alone with his new stepmother, who would dote on him and make him feel better, including in bed. Their fun and exciting days have only just begun♪