1 Allogamy On the eve of Juri's graduation, Miki comes to deliver a bouquet of roses. What he doesn't realize is that she has a different parting gift in mind, one that is destined to shift him closer to the edge of the Outside World. Juri/Miki primarily, with some mentions of Juri/Shiori and the typical unhealthy Miki/Kozue dynamic.

1 The Clarity of Distance As the fall term at her university progresses and the chasm between her and Yoshino grows ever wider, Rei finds herself startled out of bed by a late-night phone call and an unexpected intruder. A sequel to both A Perfectly Normal Kiss and Exploring the Mysteries of an Unknown World (though you don't have to have read those). Primarily Rei/Yoshino, with a mention of Rei/Sachiko.

15 Metamorphosis » A chance encounter with a familiar-looking girl leaves Sei questioning the one thing she was most sure of, and leaves Yumi completely stunned at a bizarre turn of events. An exploration of the ambiguity of soeur relationships and romantic relationships in general, with a particularly close look at Sei/Yumi, Yumi/Sachiko, and...a slightly unusual pairing.