Full Metal Panic!

Sagara Sousuke isn't your typical high school student. He reads military enthusiast magazines; he responds to questions with "affirmative;" he brings grenades to school in his bag. Though everyone at school takes him for a hopeless military geek, Chidori Kaname thinks there might be something more to him. When their plane is hijacked in the middle of a field trip, Kaname's instincts will prove correct: Sousuke is an elite, mech-piloting mercenary... and he's here to protect her! (Source: J-Novel Club)

It's been twenty years since that fierce final battle...Sousuke and Kaname are husband and wife, as well as loving parents to their children, Nami and Yasuto. A life of peace and quiet...is the last thing you'd ever see from this family! When you have parents like this, every day is bullets and bombs galore! (Source: Yen Press)