It is a simple fact that entering any library refills all HP, MP, SP, happiness, faith, hope, spiritual experience, creativity, love of life, and self-confidence, nulls or lessens the pessimism, speaking shyness, posting paralysis, mental poison, emotional burn, spiritual petrification, fallen, depression, and broken status effects, and gives bonuses to humor, sophistication, awareness, kindness, politeness, attack (under certain conditions), magic/special attack, magic/special defense, and purity.
It also has free Wi-Fi, free computers, free movies, free videogames, special events, a café, and - best of all - thousands of free books of all shapes, subjects, sizes, and colors.