Boku-tachi wa Mada Aoku
Complete | Kuroi Tsumuji | 2000 released
Arochi is a transfered student. Nanachi, one of his new classmates, is interested in him and finds a interest in common to get closer (astronomy). There's a sequel ongoing. Cuuute, I loved their dynamic. Wholesome, fluff.
Koi wo Shitara Konna Kao