Pre-supernova neutrinos are released by thermal pair production and/or weak interaction at the
end of stellar evolution. Detecting these neutrinos provide early warning prior to supernovae to
astronomical detectors, including gravitational wave detectors and neutrino detectors. KamLAND is a 1-kiloton liquid scintillator neutrino detector located in Japan. KamLAND has the capability to detect pre-supernova neutrinos from nearby stars with low background conditions through inverse beta decay.

Pre-supernova neutrino alarm system has been launched since 2015. This system is based on
significance of the statistical excess from background rate. Recently, we are preparing two major
updates. The first one is to use information of time evolution. The other is combined alarm system
with Super-Kamiokade. The latter system already started.