The collected anthologies of Satoshi Mizukami's oneshots.

Volume 1: Ribbit Ribbit
Chapter 1 - Gekogeko
About a girl whose boyfriend is a frog.

Chapter 2 - Yaichirou

Chapter 3 - Densetsu no Otoko

Chapter 4 - Joreishi

Chapter 5 - Dokusho no Jikan

Chapter 6 - Kaijin Natsugorou

Chapter 7 - High Jump Rabbit

Chapter 8 - Koutetsu Shinshou Omega Frog

Chapter 9 - Ryuu to Shoujo to Hyakkichou
Volume 2: Cheep Cheep
Chapter 1-3 - Piyopiyo
A tale of a chick which never grows into a chicken.

Chapter 4 - Makai Zanyouken: Dokidoki Jigokuhen

Chapter 5 - Ganbatte-chan to Yameyouze

Chapter 6 - Erabu Michi

Chapter 7 - Thunder Girl to Hyakkichou

Chapter 8 - Kazaana Atama to Hyakkichou
Volume 3: Galactic Emperor Ginga Thunder's Excellent Adventure
Chapter 1 - My Fist
Earth's ultimate weapon is deployed to face a threat of intergalactic proportions, and learns a little something about life.

Chapter 2 - Nell, The Artist of Shambala

Chapter 3 - Wedding Bells in Monster Town (Koi no Suzu Hyakki)

Chapter 4 - The Awakening
The terrible origin tale of the scourge of worlds, Galactic Emperor Ginga Thunder.

Chapter 5 - Kare no Tabi ga Owaru

Chapter 6 - Wani Onii-san (My Brother is a Crocodile)
Onii-san has turned into a crocodile! How is his sister, who has a brother complex, going to use love to overcome this forbidden interspecies obstacle?

Chapter 7 - Suna no Wakusei no Tami (Denizens of the Sand Planet)

Chapter 66 of Lucifer and the Biscuit Hammer was also included in this volume.
Volume 4: Wandering World
Chapter 1 - Takeyashiki Shimai, Miyaburareru

Chapter 2 - Matsuri Connection:
About a shut-in girl and a dwarf alien, who lives on her head.

Chapter 3 - Too Late for Fantasy:
When given a magic lamp, 37-year-old Tohru Sugamo wishes for his childhood dream to come true and gains all the powers he thought up once upon a time as a wannabe novelist, but it turns out an eighth grader's ideas aren't the most original - or the kinds of things you'd want causing havoc in your married life.

Chapter 4 - Fantastic Eats (Enigma Viking)
A monster hunter and his erstwhile apprentice make their living selling unknown delicacies. This stuff is safe to eat, right?

Chapter 5 - Walking the Void
When Amada Yuu was a child, the apartments were his entire world. When he learned the truth, the infinte void stretching outside would come to reside inside him as well.