
Tsubasa and Arisa are twin sisters who have not seen each other for three years due to their parents divorce. They have communicated through letters, but finally decide to meet each other again. Arisa, the more gentle of the twins, suggests that Tsubasa take her place at school for a day, just for fun. However, there are things about Arisa and her school that she has not mentioned to Tsubasa--dangerous things.
| Chapter Name | Date Added |
|---|---|
| Arisa 1 : 1 | 08/30/2009 |
| Arisa 2 : 2 | 08/30/2009 |
| Arisa 3 : 3 | 08/30/2009 |
| Arisa 4 : 4 | 08/30/2009 |
| Arisa 5 : 5 | 08/30/2009 |
| Arisa 6 : 6 | 08/30/2009 |
| Arisa 7 : 7 | 08/30/2009 |
| Arisa 9 : Planetarium | 10/20/2009 |
| Arisa 10 : | 12/02/2009 |
| Arisa 11 : | 12/11/2009 |
| Arisa 12 : 12 | 06/13/2010 |
| Arisa 13 : 13 | 06/19/2010 |
| Arisa 14 : 14 | 08/14/2010 |
| Arisa 15 : 15 | 09/05/2010 |
| Arisa 16 : | 01/31/2011 |
| Arisa 17 : | 01/31/2011 |
| Arisa 18 : | 02/15/2011 |
| Arisa 19 : | 03/14/2011 |
| Arisa 20 : | 06/08/2011 |
| Arisa 21 : | 08/02/2011 |
| Arisa 22 : | 08/14/2011 |
| Arisa 23 : | 08/27/2011 |
| Arisa 24 : | 09/17/2011 |
| Arisa 25 : | 09/25/2011 |
| Arisa 26 : | 09/25/2011 |
| Arisa 27 : | 10/20/2011 |
| Arisa 28 : | 11/10/2011 |
| Arisa 29 : | 12/17/2011 |
| Arisa 30 : | 02/20/2012 |
| Arisa 31 : | 06/05/2012 |
| Arisa 32 : | 07/08/2012 |
| Arisa 33 : Betrayal | 07/18/2012 |
| Arisa 34 : | 07/18/2012 |
| Arisa 35 : | 08/30/2012 |
| Arisa 36 : | 08/30/2012 |
| Arisa 37 : | 12/05/2012 |
| Arisa 38 : | 12/05/2012 |
| Arisa 39 : | 12/05/2012 |
| Arisa 40 : | 12/15/2012 |
| Arisa 41 : | 12/22/2012 |
| Arisa 42 : | 02/10/2013 |
| Arisa 43 : | 02/22/2013 |
| Arisa 44 : | 04/14/2013 |