My Sisters From Another World Have No Self-Control!

"Live freely and be happy, for my sake too."

Those were the last words left behind by Yuya’s sister—the only family he had.

However, suffering from the same illness as her, Yuya brought his short life to an end without ever fulfilling that promise—or so he thought, until he was reincarnated into another world as a baby.

While confused by the situation, Yuya makes a single resolution: to fulfill the promise with his sister that he couldn't keep in his past life. Seeking happiness, Yuya begins his new life as Leon, the second son of a count's family, but...

" ...Wait, what? Since I'm the child of a concubine, I'm not allowed to leave the annex? Any kind of study is completely forbidden? And my future political marriage is already set? How on earth am I supposed to live freely and be happy like this?!"

Tossed around by fate, he meets a young girl one day. The story of a boy searching for happiness and the unrestrained otherworldly sisters begins here!