| 2010/04/24-30 | MAGIC Collaboration Meeting @ Finland |
| 2010/03/09 | Presentation in a Journal Club ("Tunch") @ IPMU |
| 2010/02/19 | Seminar @ MPI for Physics |
| 2010/1/31-2/28 | Discussion in Max Planck Institute for Physics |
| 2010/01/26 | Seminar @ KEK |
| 2010/01/09 | Workshop on Gamma-ray Astronomy @ ICRR |
| 2010/01/06-07 | Workshop on Core-collapse Supernovae @ NAOJ |
| 2009/12/20-22 | The 22th RIRONKON Symposium |
| 2009/12/7-11 | IPMU focus week on indirect DM search |
| 2009/12/4 | Journal Club @ ICRR theory group |
| 2009/12/3 | The 6th JEM-EUSO Meeting @ RIKEN |
| 2009/11/27-29 | Workshop on High-energy Astrophysics and Particle Acceleration @ Miyajima |
| 2009/11/26 | Discussion in Kyoto University |
| 2009/11/10-13 | High Energy Astrophysics 2009 @ KEK |
| 2009/10/20 | Seminar @ Ohio State University |
| 2009/10/15-21 | Stay in Ohio State University for researche |
| 2009/10/12-14 | CCAPP Symposium 2009 @ Ohio State University |
| 2009/9/28-10/2 | Statistical Frontiers of Astrophysics @ IPMU |
| 2009/9/14-16 | Annual Meeting of Astronomical Society of Japan @ Yamaguchi University |
| 2009/9/10-13 | Annual Meeting of Japan Physical Society @ Konan University |
| 2009/7/7-15 | ICRC 2009 |
| 2009/6/22-23 | JEM-EUSO International Workshop |
| 2009/6/4 | Meeting @ Hongo |
| 2009/4/30 | Seminar @ IPMU |
| 2009/4/9-10 | Introduction for new employee @ Hongo |