Taichi Yagami's younger sister is Hayate
A Digimon x Magical Girl Lyrical Nanoha fanfic.
A harem featuring magical girls and Digimon.
The first season arc is full of the author's personal preferences and immature writing, so read at your own discretion.
X-Evolution World (complete) → Adventure World (complete) → Magical Girl A's (complete) → Magical Girl Reflection & Detonation (complete) → Holy Ancient Kingdom of Belka (on hiatus) → Digimon Tamers World (complete) → Adventure 02 World (complete) → V-Tamer World (on hiatus) → Frontier World (complete) → V-Tamer World (complete), Final Volume: Beyond Fate (complete)
Extra: A Different Adventure (may not be updated again)