“Who do you think is the strongest Familia in Orario?”<br>“Of course, it’s our Yavi Familia!”<br>When asked by the interviewer, Mika confidently replied.<br>After all, unlike those Familias that are only famous in the Underworld, the reputation of their Yavi Familia resounds through all the heavens!<br>In the 'Demon Slayer World,' learning breathing techniques and slaying demons.<br>In the 'Hunter World,' studying Nen abilities and battling the Ant King.<br>In the 'Type Moon World,' savoring magic and fighting with Servants.<br>Experiencing the abilities of all the worlds, building the strongest Familia.<br>This is the story of a young boy becoming a hero.<br>...<br>This book is a cross-world story, ...