Olivia 4* đủ rồi, chừng nào dư tiền hẵng up lên 5*Castle thì update full r. Trc lười k cày. Giờ nghỉ hè thì lôi ra cày. Mà oliva có nên kéo 5* k bác? Thấy mấy con dance sing lợi lắm

http://dengekionline.com/elem/000/001/549/1549092/
for chain challenge, you can pick either single chapter (5 maps) or 2 chapters (10 maps). for squad assault, there'll be 5 maps as well.
also, apparently there'll be 2x sp every Friday from 16:00 jst until sunday 15:59.
in addition, there will be a login bonus which can receive two orbs each day during the period.