With Yuito's first mission officially over, he wonders how is it possible that Kasane saved his life back when he was 5. Meanwhile, Naomi suggests to Kasane that they should take the morning off to have some rest and relaxation and they end up crossing paths with Yuito and Nagi. The foursome spend some time together until they are taken to a joint training session between the Seto and Kyoka Platoons. The teams take part in a capture the flag battle, in which Kasane comes to believe that Naomi has a crush on Yuito and uses the battle to test Yuito's worthiness for her sister...