The couple is already together from frame one, so every scene is about choosing each other instead of earning each other. Shikimori's real power isn't her coolness when danger hits, it's how the show lets you watch two people who are just comfortable enough to be soft around each other, which most romance anime never reach. It's fluff, but it knows exactly what fluff is supposed to do, and it does it without apologizing.
Izumi is a high school guy cursed with the worst luck imaginable. Every day brings some new catastrophe, from tripping down stairs to narrowly avoiding traffic. Then he meets Shikimori, a classmate who becomes his girlfriend, and suddenly his world flips. She's genuinely sweet and loves spending time with him, but the moment danger strikes, something shifts. Shikimori transforms into an impossibly cool, capable version of herself, smoothly averting disaster with style and confidence that leaves Izumi stunned. What makes their relationship work is how effortlessly she moves between these modes: one second she's blushing and adorable beside him, the next she's deflecting a speeding bicycle with casual grace. Izumi and Shikimori navigate high school alongside their quirky friend group, finding humor in the constant clash between his catastrophic luck and her uncanny ability to save the day. The comedy comes from watching someone so naturally lovely become the most badass presence whenever it matters, all while remaining completely devoted to her hopelessly accident-prone boyfriend.