Hanayome wo Ryakudatsu Sareta Ore wa, Tada Heion ni Kurashitai.

"Would I not be good enough in place of my sister?" “Hold on a second, that wedding’s not happening!” On the day of the ceremony, Shin, the groom, is left standing alone as his bride is stolen right in front of a large crowd. The next morning, exhausted and drained, his fiancée’s younger sister, Nene, shows up at his door—and before he knows it, he finds himself being doted on and living a life of indulgent pampering under her care!?