English title: KonHaru Sandwich
Japanese title: 金榛さんどいっち
It’s been established already that Haruna can be be a bad girl, hoarding the Admiral’s attention, but in this books we see that her older sister Kongou is not much better.
The two sisters agree to “share” Admiral for one night and Admiral is not one to raise a fuss over such issues. What follows is heated three-way naval exercise is the bedroom, with Admiral finding himself sandwiched between the two well-endowed sisters.