<p>My Friend's Little Sister Has It In For Me! Novel Volume 4 was written by mikawaghost and illustrated by tomari.</p> <p>Mashiro has just shared a devastating secret with Sumire.</p> <p>Aki and Iroha have been forced through a ceremony that historically guarantees the participants will be married.</p> <p>Meanwhile, Sumire is on the brink of freedom—but just what will she do with it?</p> <p>So much for Aki’s efficient summer plans! Worse, he finds out the foundations beneath his Alliance are pillars of salt and sand.</p> With the Alliance pulled in all directions, will it even last the summer, or will it sink into the depths of the ocean? <div style="text-align:center;"> <a href="https://devstore.crunchyroll.com/products/my-friends-little-sister-has-it-in-for-me-novel-volume-3-9781718326828.html" onblur="this.style.outline='2px solid transparent';" onfocus="this.style.outline='2px solid #000000';" style="display:inline-block; width:180px; margin:10px; padding:10px 20px; background-color:#fab818; color:#000000; text-decoration:none; border-radius:5px; font-weight:bold; text-align:center; outline: 2px solid transparent; font-size:16px;" aria-label="Go to previous volume in series">&larr; Previous Volume</a> <a href="https://devstore.crunchyroll.com/products/my-friends-little-sister-has-it-in-for-me-novel-volume-5-9781718326842.html" onblur="this.style.outline='2px solid transparent';" onfocus="this.style.outline='2px solid #000000';" style="display:inline-block; width:180px; margin:10px; padding:10px 20px; background-color:#fab818; color:#000000; text-decoration:none; border-radius:5px; font-weight:bold; text-align:center; outline: 2px solid transparent; font-size:16px;" aria-label="Go to next volume in series">Next Volume &rarr;</a> </div>