Please don't list this on a work's page as a trope. Examples can go on the work's YMMV tab.
Tear Jerker: Figure17: Tsubasa & Hikaru
Figure 17 has a good few: Hikaru almost dying in the battle against the 7th Maguar, Tsubasa's reaction to Sho's sudden off-screen death at the end of episode 9, and of course Hikaru really dying at the end of the last episode. Try watching the ending credits after all this and watch as what was once cheesy becomes heartbreaking.