It's basically a short story split into 5 parts. Yes, only 4 are visible in the chapter list, but all 5 are on the translator website as of this review. A simple short story of a man (Satoshi), who marries his childhood friend and crush (Sayuri) 's, little sister (Ranko). Told primarily through the lens of the little sister Ranko, in the form of a conversation between the sisters when Satoshi and Ranko come back to visit her parents house to announce their marriage, with reflections from Ranko and some... more>> additional perspectives from Sayuri and her parents giving extra details about how it all happened.

It perfectly showcases the consequences of Sayuri's foolishness and s*upidity, the room temperature IQ of her parents, and Ranko's love and devotion being rewarded in the final chapter after she takes revenge on her own sister and parents for what they did in a very equal and befitting manner. Our MC Satoshi also is rewarded for his suffering as he and Ranko are married with news of her pregnancy.

Story was 10/10 in my opinion, the plot playing out in such a way that it all comes around perfectly, with a well deserved happy ending in the last chapter as Sayuri and her parents get what they want, and Ranko cutting off ties with her sister and parents as she and Satoshi become happy together. <<less