そらに陽だまり [Sora ni Hidamari] Series by Monika Kaname

Himari Akeno can’t wait to start high school! Even though she’s parting ways with her twin sister, Mio, Himari’s enthusiasm to start this new chapter of her life is palpable—that is, until a traumatic incident sends her home to hide in her room…Watching Himari’s dreams shatter is more than Mio can bear, especially when her sister still longs for an ordinary student life... moreHimari Akeno can’t wait to start high school! Even though she’s parting ways with her twin sister, Mio, Himari’s enthusiasm to start this new chapter of her life is palpable—that is, until a traumatic incident sends her home to hide in her room…Watching Himari’s dreams shatter is more than Mio can bear, especially when her sister still longs for an ordinary student life. Determined to see her twin get back out into the world, Mio “catches a cold” and convinces her sister to fill in until she “recovers.” As long as the shy, introverted Himari can pull off impersonating the bubbly, energetic Mio, nothing could go wrong…right? less

Himari and Mio have traded places during the school festival—but what will Himari do when someone recognizes her? Meanwhile, after hearing a rumor that a confession at the after party will lead to romance, Mio decides to tell Asaka how she feels…

Asaka and Tsukiyono reveal to Himari and Mio that they know about their switcheroos—but Tsukiyono may have an even bigger secret to tell! When the truth finally comes to light, will it mean a happy ending for the sisters?