In a twist of fate, Yann, once a fearsome Lich King in a previous life, finds himself reincarnated as a tentacle monster in his current one. But what happens when a delectable little girl crosses paths with this unlikely creature? "Others may traverse realms to become heroes, but I traverse to become a tentacle monster," Yann jests. "While others wield cheat codes, I become the cheat code for others. And while others command legions of magical beasts, I become the pet of another, albeit fortunately, the pet of a lovely young maiden. And you there, dare to harm my little maiden? You won't escape my grasp after school! I'll make sure of it!" "My dream is to use my tentacles to ensure a blissful life for my little maiden at home! Anyone who dares obstruct me from building our crystal palace will face my wrath!" With such determined words, Yann sets out on a whimsical yet ambitious quest, using his unusual abilities to protect and provide for his newfound charge, all while dreaming of a brighter future in their crystal abode.