- 2003-02-01 Se'ikspia is formed by bassist SETSUKI (雪季).
- 2003-02-01 【V. RUKA (蝣華) / G. TAISUKE (泰祐) / B. SETSUKI (雪季) / D. KAI (廻)】
- 2003-02-26 First live is held at Shinsaibashi (心斎橋) FANJ-twice.
- 2003-05-01 Se'ikspia founds independent record label ZERO-DISK.
- 2003-05-02 OATH released.
- 2003-05-02 Kyoto-Osaka-Kobe mini-tour, OATH, begins at Nishikujou (西九条) BRAND NEW.
- 2003-05-26 Mini-album OATH ranks #9 in I.D.PILOT DEAD ONE monthly ranking.
- 2003-06-01 Mini-tour final is held at Nanba (難波) ROCKETS.
- 2003-06-21 Bassist SETSUKI (雪季) secedes. The band continues as 3 members.
- 2003-06-21 【V. RUKA (蝣華) / G. TAISUKE (泰祐) / D. KAI (廻)】
- 2003-06-21 Label ZERO-DISK is dissolved.
- 2003-08-19 Tokyo-Nagoya-Osaka tour, TOUR 2003 ~SWEET PAIN~, begins at Ikebukuro (池袋) CYBER.
- 2003-08-19 Bassist JUYA (樹弥~JUYA~) officially joins, and members change notation of their names.
- 2003-08-19 【V. RUKA (蝣華~RUKA~) / G. TAISUKE (泰祐~TAISUKE~) / B. JUYA (樹弥~JUYA~) / D. KAI (廻~KAI~)】
- 2003-10-08 Tour final is held at Osaka (大阪) Club vijon.
- 2003-11-15 Second mini-album, and upcoming disbandment, is announced.
- 2003-11-22 FENRIR (フェンリル)―former band of V. RUKA, G. TAISUKE, and D. KAI―holds one-day revival at Sennichimae (千日前) CRUST.
- 2003-12-27 SWEET PAIN First Press released.
- 2003-12-31 Last live is held during UNDER CODE PRODUCTION sponsored countdown event, Kansai Seiatsu (関西制圧), at Osaka (大阪) CHOCOLATE CITY.
- 2003-12-31 Se'ikspia disbands
- 2004-01-17 SWEET PAIN Second Press released.
- 2004-01-21 Mini-album “SWEET PAIN” ranks #6 in I.D.PILOT DEAD ONE weekly ranking.
- 2004-02-14 Se'ikspia holds one-day revival during UNDER CODE PRODUCTION sponsored session night, Kizokutachi no Dai SESSION Matsuri Dainiyoru (貴族達の大セッション祭り 第二夜), at Esaka (江坂) BOOMIN HALL.
- 2004-02-21 Memorial last mini-album, Dearest, is produced by and released through UNDER CODE PRODUCTION.
- 2004-02-21 Dearest released.
- 2004-03-03 Memorial mini-album Dearest ranks #9 in I.D.PILOT DEAD ONE weekly ranking.
- 2005-12-20 Japanesque Rock Collectionz CureⅡ UNDER CODE PRODUCTION ALL CAST MUSEUM released.
- 2015-12-10 Upcoming [limited?] revival is announced.
- 2016-01-03 It is announced that ex-bassist SETSUKI has suddenly decided to participate in upcoming revival. The band will perform as 5 members.
- 2016-01-24 Revival live is held at Nanba (難波) ROCKETS.
- 2016-01-24 【V. RUKA / G. TAISUKE / B. SETSUKI / B. JUYA / D. KAI】