A manga series runs for years, and the reader remembers everything. Kalan Vidhi keeps a growing cast, an escalating power system and a long arc structure straight, so chapter one hundred still agrees with chapter four.
Every character gets a full record — appearance, personality, motivation, faction, current power rank, arc — and they cross-reference each other. When a rival becomes an ally, the relationship graph shows it, and every chapter that character appears in is one click away.
Shonen lives or dies on whether the power system holds up. Define ranks that differ in kind rather than only in magnitude, give each one breakthrough conditions and hard limits, and attach named techniques to the rank that unlocks them. The canon check then flags characters who used a technique above their rank.
Plan the series as dramatic units first — each arc with a goal, mandatory events that must happen, and optional subplots — then break arcs into chapters. It keeps a long serial from wandering, and it means you always know what this chapter is for.
Chapters hold a summary, key events in order, the scenes with their settings and emotional beats, and the cast present. Whether you script panels elsewhere or write prose here, the structure and the canon live in one place.