diff --git a/CHANGELOG.md b/CHANGELOG.md
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--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,11 @@
+# Changelog for `try-storable-peek-poke`
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to the
+[Haskell Package Versioning Policy](https://pvp.haskell.org/).
+
+## Unreleased
+
+## 0.1.0.0 - YYYY-MM-DD
diff --git a/LICENSE b/LICENSE
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--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,30 @@
+Copyright Yoshikuni Jujo (c) 2023
+
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+
+    * Redistributions in binary form must reproduce the above
+      copyright notice, this list of conditions and the following
+      disclaimer in the documentation and/or other materials provided
+      with the distribution.
+
+    * Neither the name of Yoshikuni Jujo nor the names of other
+      contributors may be used to endorse or promote products derived
+      from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/README.md b/README.md
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--- /dev/null
+++ b/README.md
@@ -0,0 +1,1 @@
+# storable-peek-poke
diff --git a/Setup.hs b/Setup.hs
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--- /dev/null
+++ b/Setup.hs
@@ -0,0 +1,2 @@
+import Distribution.Simple
+main = defaultMain
diff --git a/src/Foreign/Storable/PeekPoke.hs b/src/Foreign/Storable/PeekPoke.hs
new file mode 100644
--- /dev/null
+++ b/src/Foreign/Storable/PeekPoke.hs
@@ -0,0 +1,20 @@
+{-# LANGUAGE PatternSynonyms #-}
+{-# OPTIONS_GHC -Wall -fno-warn-tabs #-}
+
+module Foreign.Storable.PeekPoke (
+
+	-- * Sizable, Peek and Poke
+
+	Sizable(..), Peek(..), peekMaybe, Poke(..),
+
+	-- * Peekable, WithPoked and Pokable
+
+	Peekable, peekArray',
+	WithPoked(..), PtrS, ptrS, withPtrS, withPokedMaybe',
+	Pokable, withPoked, withPokedMaybe,
+
+	-- * Storable' and NullPtr
+
+	Storable', pattern NullPtr ) where
+
+import Foreign.Storable.PeekPoke.Internal
diff --git a/src/Foreign/Storable/PeekPoke/Internal.hs b/src/Foreign/Storable/PeekPoke/Internal.hs
new file mode 100644
--- /dev/null
+++ b/src/Foreign/Storable/PeekPoke/Internal.hs
@@ -0,0 +1,104 @@
+{-# LANGUAGE ImportQualifiedPost #-}
+{-# LANGUAGE BlockArguments, LambdaCase #-}
+{-# LANGUAGE ScopedTypeVariables, RankNTypes, TypeApplications #-}
+{-# LANGUAGE MonoLocalBinds #-}
+{-# LANGUAGE DataKinds #-}
+{-# LANGUAGE AllowAmbiguousTypes #-}
+{-# LANGUAGE FlexibleInstances, UndecidableInstances #-}
+{-# LANGUAGE PatternSynonyms, ViewPatterns #-}
+{-# OPTIONS_GHC -Wall -fno-warn-tabs #-}
+
+module Foreign.Storable.PeekPoke.Internal (
+
+	-- * Sizable, Peek and Poke
+
+	Sizable(..), Peek(..), peekMaybe, Poke(..),
+
+	-- * Peekable, WithPoked and Pokable
+
+	Peekable, peekArray',
+	WithPoked(..), PtrS(..), ptrS, withPtrS, withPokedMaybe',
+	Pokable, withPoked, withPokedMaybe,
+
+	-- * Storable' and NullPtr
+
+	Storable', pattern NullPtr ) where
+
+import Foreign.Ptr
+import Foreign.Marshal.Alloc
+import Foreign.Storable
+import Data.TypeLevel.Maybe qualified as TMaybe
+import Data.TypeLevel.ParMaybe qualified as TPMaybe
+
+class Sizable a where sizeOf' :: Int; alignment' :: Int
+class Peek a where peek' :: Ptr a -> IO a
+class Poke a where poke' :: Ptr a -> a -> IO ()
+
+class (Sizable a, Peek a) => Peekable a
+instance (Sizable a, Peek a) => Peekable a
+
+class (Sizable a, Poke a, WithPoked a) => Pokable a
+instance (Sizable a, Poke a) => Pokable a
+
+class (Peekable a, Pokable a, Storable a) => Storable' a
+instance (Peekable a, Pokable a, Storable a) => Storable' a
+
+instance {-# OVERLAPPABLE #-} Storable a => Sizable a where
+	sizeOf' = sizeOf @a undefined
+	alignment' = alignment @a undefined
+
+instance {-# OVERLAPPABLE #-} Storable a => Peek a where peek' = peek
+instance {-# OVERLAPPABLE #-} Storable a => Poke a where poke' = poke
+
+withPoked :: Pokable a => a -> (Ptr a -> IO b) -> IO b
+withPoked x f = alloca' \p -> poke' p x >> f p
+
+withPokedMaybe :: Pokable a => Maybe a -> (Ptr a -> IO b) -> IO b
+withPokedMaybe = \case Nothing -> ($ NullPtr); Just x -> withPoked x
+
+alloca' :: forall a b . Sizable a => (Ptr a -> IO b) -> IO b
+alloca' = allocaBytesAligned (sizeOf' @a) (alignment' @a)
+
+pattern NullPtr :: Ptr a
+pattern NullPtr <- ((== nullPtr) -> True) where NullPtr = nullPtr
+
+peekMaybe :: Peek a => Ptr a -> IO (Maybe a)
+peekMaybe = \case NullPtr -> pure Nothing; p -> Just <$> peek' p
+
+peekArray' :: forall a . Peekable a => Int -> Ptr a -> IO [a]
+peekArray' n ((`alignPtr` (alignment' @a)) -> p)
+	| n <= 0 = pure []
+	| True = (:) <$> peek' p <*> peekArray' (n - 1) (p `plusPtr` sizeOf' @a)
+
+newtype PtrS s a = PtrS_ (Ptr a) deriving Show
+
+ptrS :: Ptr a -> PtrS s a
+ptrS = PtrS_
+
+castPtrS :: PtrS s a -> PtrS s b
+castPtrS (PtrS_ p) = PtrS_ $ castPtr p
+
+pattern NullPtrS :: PtrS s a
+pattern NullPtrS <- PtrS_ NullPtr where NullPtrS = PtrS_ NullPtr
+
+withPtrS :: PtrS s a -> (Ptr a -> IO b) -> IO ()
+withPtrS (PtrS_ p) = (() <$) . ($ p)
+
+class WithPoked a where
+	withPoked' :: a -> (forall s . PtrS s a -> IO b) -> IO b
+
+instance {-# OVERLAPPABLE #-} Pokable a => WithPoked a where
+	withPoked' x f = withPoked x $ f . ptrS
+
+withPokedMaybe' :: WithPoked a =>
+	Maybe a -> (forall s . PtrS s a -> IO b) -> IO b
+withPokedMaybe' = \case Nothing -> ($ NullPtrS); Just x -> withPoked' x
+
+instance WithPoked (TPMaybe.M t 'Nothing) where
+	withPoked' TPMaybe.N f = f $ ptrS nullPtr
+
+instance WithPoked (t a) => WithPoked (TPMaybe.M t ('Just a)) where
+	withPoked' (TPMaybe.J x) f = withPoked' x (f . castPtrS)
+
+instance {-# OVERLAPPABLE #-} WithPoked a => WithPoked (TMaybe.Id a) where
+	withPoked' (TMaybe.Id x) f = withPoked' x (f . castPtrS)
diff --git a/storable-peek-poke.cabal b/storable-peek-poke.cabal
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--- /dev/null
+++ b/storable-peek-poke.cabal
@@ -0,0 +1,54 @@
+cabal-version: 1.12
+
+-- This file has been generated from package.yaml by hpack version 0.37.0.
+--
+-- see: https://github.com/sol/hpack
+
+name:           storable-peek-poke
+version:        0.1.0.1
+synopsis:       class Sizable, Peek and Poke
+description:    Please see the README on GitHub at <https://github.com/YoshikuniJujo/storable-peek-poke#readme>
+category:       Data, Foreign
+homepage:       https://github.com/YoshikuniJujo/storable-peek-poke#readme
+bug-reports:    https://github.com/YoshikuniJujo/storable-peek-poke/issues
+author:         Yoshikuni Jujo
+maintainer:     yoshikuni.jujo@gmail.com
+copyright:      @2023 Yoshikuni Jujo
+license:        BSD3
+license-file:   LICENSE
+build-type:     Simple
+extra-source-files:
+    README.md
+    CHANGELOG.md
+
+source-repository head
+  type: git
+  location: https://github.com/YoshikuniJujo/storable-peek-poke
+
+library
+  exposed-modules:
+      Foreign.Storable.PeekPoke
+      Foreign.Storable.PeekPoke.Internal
+  other-modules:
+      Paths_storable_peek_poke
+  hs-source-dirs:
+      src
+  ghc-options: -Wall -Wcompat -Widentities -Wincomplete-record-updates -Wincomplete-uni-patterns -Wmissing-export-lists -Wmissing-home-modules -Wpartial-fields -Wredundant-constraints
+  build-depends:
+      base >=4.7 && <5
+    , typelevel-tools-yj
+  default-language: Haskell2010
+
+test-suite storable-peek-poke-test
+  type: exitcode-stdio-1.0
+  main-is: Spec.hs
+  other-modules:
+      Paths_storable_peek_poke
+  hs-source-dirs:
+      test
+  ghc-options: -Wall -Wcompat -Widentities -Wincomplete-record-updates -Wincomplete-uni-patterns -Wmissing-export-lists -Wmissing-home-modules -Wpartial-fields -Wredundant-constraints -threaded -rtsopts -with-rtsopts=-N
+  build-depends:
+      base >=4.7 && <5
+    , storable-peek-poke
+    , typelevel-tools-yj
+  default-language: Haskell2010
diff --git a/test/Spec.hs b/test/Spec.hs
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--- /dev/null
+++ b/test/Spec.hs
@@ -0,0 +1,2 @@
+main :: IO ()
+main = putStrLn "Test suite not yet implemented"