-Main character is an energetic, large breasted red head
-She's in a relationship with a muscular guy with black hair
-She keeps trying to make that guy flustered by being romantic and flirtatious with him
-Guy keeps taking it in stride
-All her attempts end in her being the one flustered
-One of her best friends is a black-haired, serious girl who has a light-haired guy that annoys her and is in love with her, and the light-haired guy friends with the black-haired guy
...
No Guard Wife is actually a stealth sequel to Tomo-chan, isn't it?