| title | ISBN-13 | year of publication |
|---|---|---|
| Happy Cafe 8 | 978-1-4278-1737-2 | 2011 |
| Happy Cafe, Vol. 1 | 978-1-4278-1730-3 | 2010 |
| Happy Cafe, Vol. 2 | 978-1-4278-1731-0 | 2010 |
| Happy Cafe, Vol. 3 | 978-1-4278-1732-7 | 2010 |
| Happy Cafe, Vol. 4 | 978-1-4278-1733-4 | 2010 |
| Happy Cafe, Vol. 5 | 978-1-4278-1734-1 | 2010 |
| Happy Cafe, Vol. 6 | 978-1-4278-1735-8 | 2010 |
| Happy Cafe, Vol. 7 | 978-1-4278-1736-5 | 2011 |