If you are looking for a specific "Link" or feature, it might refer to one of these:
"Touch Advance Link" is an interactive bonding system that allows players to deepen their relationship with specific "Moe" (cute/endearing) characters. By physically interacting with the character via the screen and meeting specific prerequisites, players unlock "Links"—permanent stat boosts, unique character skins, or backstory snippets. moe girl touch advance link
Simply touching randomly is not enough. To "Advance," the player must discover the character's preferences. If you are looking for a specific "Link"