I Use Cause and Effect to Prove My Path to Immortality

Everything in the world has a "karma debt". The heroine obtains the "Tianheng Book" (a fragment of the way of heaven) and can see the causal lines and debts between herself and others: who owes her, whom she owes, and what she owes (fate/grace/blood/tradition/chance). Every time she clears a causal debt (not simply killing people for revenge, but completing the "causal closed loop"), she can obtain "weighted value", which can be used for: Cleanse spiritual roots, replenish root bones, and perform exercises Exchange for special abilities such as "Causal Avoidance", "Broken Fate", "Leverage" and other special abilities (the more you use them, the more you have to pay, and the backlash is very delicious) The cause and effect book is not a cheat: it is like an account book, and every transaction must be settled. If you want to have sex for free, it will "reverse into the account".