ultimate friendship handbook

Japanese: フレンドシップ ガイド
Chinese: 友情提升手册
Germam: Freundschafs-Handbuch

Update 12-07-2020 (version 1.3): Changes to daily gift points rewards.
Update 13-08-2020 (version 1.4): Changes to daily gift points sell prices, slight modification to birthday gifts.

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credits