Feature spec
Goal: Send a clear invoice after finishing a job.
- Add a client, line items, a due date, and payment instructions.
- Preview the total before exporting a PDF.
- Keep an editable draft if export fails.
App Overview
リトルバスターズ！ＳＳ Vol.01
リトルバスターズ！ＳＳ Vol.01
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
1 ratings · Top 5%
Evidence scope: No current overall US chart position is available. Category-chart positions shown in discovery are a separate scope. Revenue is a directional model estimate, not verified earnings.
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A product spec, screen plans, and build steps for your coding agent.
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What's included16 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
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Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Screen plan
Invoice editor: Client at the top, editable line items in the middle, total and preview action at the bottom.
States: Empty draft, validation errors beside each field, exporting, and a retry action that preserves the draft.
Differentiate and validate
Hypothesis: Contractors need faster repeat invoices more than more templates.
First experiment: Test duplicating a previous job with five contractors. Watch where they hesitate before expanding the feature set.
The full kit adds a phased build plan, evidence notes, tool prompts, and implementation guidance. It is a plan for your coding agent, not a finished app.
Usage: Mechanics are fair game; never reuse the original name, branding, assets, or verbatim copy.
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Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for リトルバスターズ！ＳＳ Vol.01: map the core Books workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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Opportunities
AI-GENERATED OPPORTUNITY HYPOTHESES
These are generated suggestions, not verified review quotations. Check current App Store reviews and speak with users before treating a possible gap as a requirement.
Hypothesis 1
Introduce curated recommendations and user-generated content.
Assumption to check: Limited content variety in the library
Validate with people who use this workflow before building.
Hypothesis 2
Implement an onboarding tutorial to guide first-time users.
Assumption to check: Difficult navigation for new users
Validate with people who use this workflow before building.
Hypothesis 3
Optimize content loading and provide progress indicators.
Assumption to check: Inconsistent loading times for visual novels
Validate with people who use this workflow before building.
Hypothesis 4
Add community features for users to discuss novels.
Assumption to check: Lack of user engagement features like comments
Validate with people who use this workflow before building.
App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
App Store description
リトルバスターズ！ＳＳ Vol.01 特別価格 85 円 「リトルバスターズ！」 公式ショートストーリー第一弾！ リトルバスターズ！の本編では語られなかった外伝的ショートストーリーです。 過去、様々な雑誌や小冊子などに収録された、今では手に入りづらいショートストーリーをアプリでお届けします！ 全編、10分程度で気軽に読める内容で、リトルバスターズのキャラクターたちの側面を楽しもう！ 第一弾の今回は、「神北小毬」を中心とした、「リトルバスターズ！」本編の物語の始まる前のストーリーとなっています。 主人公・直枝理樹は幼い日に両親を亡くし、絶望の中にいた。それを救ったのがリトルバスターズと名乗る少年たち（棗恭介・井ノ原真人・宮沢謙吾・棗鈴）だった。彼らは理樹を連れだし、いろんなものを悪役に仕立て上げ、成敗して回った。彼らは馬鹿で返り討ちばかりあったけど、とても楽しかった。彼らと一緒にいると、寂しさや痛みはやがて癒えていった。そうして時は経ち彼らは同じ学園に入学し、今年で二年生。今日も恭介の発案の元、馬鹿を続け、彼らは青春をひた走る。 ※本アプリにボイスは収録されておりません 企画・シナリオ：Key 原画：樋上いたる Na-Ga 音楽：折戸伸治 麻枝 准 戸越まごめ PMMK 三輪 学
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Screenshots
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Build scope
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Define the first version
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Set boundaries
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Check the hard parts
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
SUGGESTED BUILD STACK
React Native
Expo
Zustand
react-navigation
expo-image
BUILD KIT DIFFICULTY
Starter
From the Build Kit assessment.
A reliable timeline needs an agreed scope and a technical check. Ask your agent to estimate the phases in BUILD_PLAN.md after that review.
