Reborn at Seven: My Mission Is to Protect Toyama and Kazuha

Hattori Heiji is reborn at the age of seven. The first person he sees is his wife, Toyama Kazuha, who died six years ago in his previous life. The second thing he sees is a System interface. Core mission: Protect Toyama Kazuha and see her safely through this generation. Rule One: Before the target turns twenty-one, the Host must not cross the line. Rule Two: If the target is out of the Host's sight for more than thirty minutes, a danger alert will be triggered. Rule Three: The target has gained an absolute charm effect, and no one of the opposite sex her age can resist her allure. By the time Heiji comes to his senses, a whole group of elementary schoolers has gathered behind him. Soshi Okita: Kazuha! Hit me with your sword again! I promise I won't pass out this time. Hijiri Fukushiro: Don't get the wrong idea, I'm just passing by... Kazuha's shoelace is untied. Doesn't anyone see it? Momiji Ooka: I had my grandfather buy Kaido Elementary School. From now on, Kazuha will only sit with me. Heiji: ...Why are you getting involved? You're a girl. Momiji Ooka: Love knows no gender. The System pops up at just the right moment: Ding! The Kansai Junior Detective Squad has formed on its own. Host, prepare for the long haul. Heiji: Who told you to form it? Did I approve this? Kazuha: Heiji, everyone says they want to help me solve cases. They're all really good at it. Why don't you praise them too? Heiji: Praise them my All in all, this is a story about serving as his childhood friend's personal bodyguard around the clock, getting repeatedly ground down by the System's perverse rules, and managing a Kansai junior detective squad whose every member has designs on his little fiancée. And it will be a full eleven years before she can legally be his. The System says, "Keep it up, Host!" Heiji says...