Collection of short stories:

Volume 1: Gekogeko

Volume 2: Piyopiyo

Volume 3: Uchuu Taitei Ginga Thunder no Bouken
Wani Onii-san (Crocodile Brother): 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?

Volume 4: Hourou Sekai / Wandering World

1. Takeyashiki Shimai, Miyaburareru (竹屋敷姉妹、みやぶられる)
2. Matsuri Connection (まつりコネクション)
   About a shut-in girl and a dwarf alien, who lives on her head.
3. 3. Imasara Fantasy (今更ファンタジー, 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.
4. Enigma Viking (エニグマバイキング)
5. Kyomu wo Yuku (虚無をゆく, Walking the Void)
   When Amada Yuu was a child, the apartments were his entire world. When he learned the truth, the infinite void stretching outside would come to reside inside him as well.